A038338 → D+1

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Submission text ?

Triangle begins:
  0:           432,            576,             144;
  1:          6912,          15552,           10368,             1728;
  2:        103680,         331776,          373248,           165888,            20736;
  3:       1492992,        6220800,         9953280,          7464960,          2488320,           248832;
  4:      20901888,      107495424,       223948800,        238878720,        134369280,         35831808,          2985984;
  5:     286654464,     1755758592,      4514807808,       6270566400,       5016453120,       2257403904,        501645312,         35831808;
  6:    3869835264,    27518828544,     84276412416,     144473849856,     150493593600,      96315899904,      36118462464,       6879707136,       429981696;
  7:   51597803520,   417942208512,   1486016741376,    3033950846976,    3900793946112,    3250661621760,    1733686198272,     557256278016,     92876046336,      5159780352;
  8:  681091006464,  6191736422400,  25076532510720,   59440669655040,   91018525409280,   93619054706688,   65013232435200,   29720334827520,   8358844170240,   1238347284480,    61917364224;
  9: 8916100448256, 89904012853248, 408654603878400, 1103367430471680, 1961542098616320, 2402889070804992, 2059619203547136, 1225963811635200, 490385524654080, 122596381163520, 16346184155136, 743008370688;

The row polynomials satisfy (n+2+x)*P(n,x) = (12*n+36+(12*n+48)*x+12*x^2)*P(n-1,x) for n >= 1, with P(0,x) = 432 + 576*x + 144*x^2.

P[0, x_] := 432 + 576*x + 144*x^2;
P[n_, x_] := P[n, x] = Expand[Together[((12*n + 36 + (12*n + 48)*x + 12*x^2)*P[n - 1, x])/(n + 2 + x)]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten

P(N) = {my(v = vector(N + 1)); v[1] = 432 + 576*x + 144*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((12*n + 36 + (12*n + 48)*x + 12*x^2)*v[i - 1])/(n + 2 + x)); v};
row(n, p) = {my(c = Vecrev(p)); c};
T(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};
T(9)

Properties

• Real-rooted? Every row P_n, n ≥ 0, is zero or real-rooted with all roots in (−∞, 0]
  by Laguerre’s theorem on differential operators
• Coefficients of one sign? Every nonzero row, n ≥ 0: the coefficients of P_n have one sign
  derived from Laguerre’s theorem on differential operators
• Hadamard kernel (Malo)? Rows P_n, n ≥ 0, are Hadamard kernels (preserve real-rootedness)
  derived from Laguerre’s theorem on differential operators
• Interlacing of consecutive rows? Rows P_(m-1), P_m interlace (weak, unordered) for every m ≥ 1
  by Laguerre’s theorem on differential operators

Proof chains ? JSON

• Laguerre’s theorem on differential operators [SP14] polytool ? step ›

  • from Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*12^j.?
    • Row-hypergeometric rows (multiplier sequences) [SP14; Bra15, Thm 7.1 of arXiv:1410.6601] polytool RealRooted RealRooted.isPFMultiplierSequence_eval_of_roots_nonpos RealRooted RealRooted.isPFMultiplierSequence_inv_ascPochhammer RealRooted RealRooted.IsPFMultiplierSequence.mul ? step › direct check
    • Liu–Wang theorem [LW07, Thm 2.1, Cor 2.4] ? step › direct check
    • Parent-row provers of polytool polytool ? step › direct check
    • Iterated real-rootedness preservers [SP14; Bra15, Thm 7.1 of arXiv:1410.6601; Bra06, Cor 3.5] polytool ? step › direct check
    • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

      • from Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*12^j.?
        • ↑ Row-hypergeometric rows (multiplier sequences) (above)
        • ↑ Liu–Wang theorem (above)
        • ↑ Parent-row provers of polytool (above)
        • ↑ Iterated real-rootedness preservers (above)

Related ?

Same fingerprint ?

• A038325 → θ+1
• A028326 → D → θ+1
• A135838 → θ+1
• A085880 → basis A013609 → D+1
• A038338 → θ+1
• A135838 → D+1
• A038338 → basis A013609 → θ+1
• A038221 → basis A013609 → D+1
• A131431 → x ↦ x+1 → θ+1
• A178820 → basis A013609 → θ+1
• A038338 → basis A013609 → D+1
• basis-map coefficients of A127647 → D+1
• A135065 → θ+1
• basis-map coefficients of A113214, shifted → D+1
• basis-map coefficients of A113214, shifted → D → θ+1
• A356546 → basis A013609 → θ+1
• A038325 → D+1
• basis-map coefficients of A113214, shifted → basis A013609 → D+1
• basis-map coefficients of A026729 → basis A007318 → θ+1
• A085880 → basis A013609 → θ+1
• A085881 → D+1
• A038325 → basis A013609 → D+1
• A178821 → θ+1
• A156992 → θ+1
• A038208 → D → θ+1
• A356546 → D+1
• basis-map coefficients of A026729 → basis A007318 → D+1
• A196347 → θ+1
• A027465 → basis A013611 → θ+1
• A038221 → D+1
• A028326 → basis A013609 → D+1
• A007318 → ×(−(1/2)n+(1/2)n²) → θ+1
• A028326 → D → D+1
• A124860 → D+1
• A356546 → basis A013609 → D+1
• A028326 → D+1
• A085880 → D → θ+1
• basis-map coefficients of A113214, shifted → D → D+1
• A120910 → basis A013610 → D+1
• A196347 → basis A013609 → θ+1
• A027465 → basis A013611 → D+1
• basis-map coefficients of A026729, shifted → basis A007318 → D+1
• A120910 → basis A013610 → θ+1
• A131431 → x ↦ x+1 → D+1
• A178822 → basis A013609 → D+1
• A131431 → D+1 → basis A007318
• A003506 → D → θ+1
• basis-map coefficients of A026729, shifted → basis A007318 → θ+1
• A028326 → θ+1
• basis-map coefficients of A112227 → x ↦ x+1 → θ+1
• A376827 → θ+1
• A156992 → basis A013609 → θ+1
• A134346 → θ+1
• A007318 → ×(−(1/2)n+(1/2)n²) → D+1
• A038330 → basis A013611 → D+1
• basis-map coefficients of A113214, shifted → basis A013609 → θ+1
• A178821 → basis A013609 → θ+1
• A093375 → D
• A094305 → D+1
• A376827 → D+1
• A134346 → D+1
• A196347 → basis A013609 → D+1
• A178822 → D+1
• A038208 → D → D+1
• A156992 → basis A013609 → D+1
• A178820 → D+1
• A124860 → θ+1
• A085881 → basis A013609 → θ+1
• A085880 → D → D+1
• A038208 → D+1
• A103406: Triangle read by rows: n-th row = unsigned coefficients of the characteristic polynomials of an n X n matrix w…
• A178821 → basis A013609 → D+1
• A178821 → D+1
• A093375: Array T(m,n) read by ascending antidiagonals: T(m,n) = m*binomial(n+m-2, n-1) for m, n >= 1.
• A085881 → basis A013609 → D+1
• A085881 → θ+1
• A085880 → θ+1
• A344565 → D+1
• A038221 → basis A013609 → θ+1
• A135065 → D+1
• A196347 → D+1
• A344565 → θ+1
• A178822 → θ+1
• A094305 → θ+1
• A038330 → basis A013611 → θ+1
• A038325 → basis A013609 → θ+1
• basis-map coefficients of A127647 → θ+1
• A156992 → D+1
• A085880 → D+1
• A178820 → θ+1
• A093375 → D → D
• A178822 → basis A013609 → θ+1
• basis-map coefficients of A113214, shifted → θ+1
• A178820 → basis A013609 → D+1
• A356546 → θ+1
• A028326 → basis A013609 → θ+1
• A216973 → θ+1
• A038221 → θ+1
• basis-map coefficients of A112227 → x ↦ x+1 → D+1
• A038208 → θ+1

References

1. [Bra06] Petter Brändén. On linear transformations preserving the Pólya frequency property. Transactions of the American Mathematical Society, 358(8):3697–3716, February 2006. doi:10.1090/s0002-9947-06-03856-6
2. [Bra15] Petter Brändén. Unimodality, log-concavity, real-rootedness and beyond. Handbook of enumerative combinatorics, :437–483, March 2015. doi:10.1201/b18255-10
3. [LW07] Lily L. Liu and Yi Wang. A unified approach to polynomial sequences with only real zeros. Advances in Applied Mathematics, 38(4):542–560, May 2007. doi:10.1016/j.aam.2006.02.003
4. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.