A178822 → basis A013609 → basis A013609

palindromicγ-positivenonnegative coefficientsonly rational roots

Proved for all n all roots real, in (−∞, 0]coefficients of one signHadamard kernelinterlacing (weak)

Recurrence

\(\left(n\right)\,P_{n}(x) = \left(20 + 20\,x + 4\,n + 4\,n x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 1\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
011
1242448
23366723361344
335841075210752358428672
43225612902419353612902432256516096
525804812902402580480258048012902402580488257536
6189235211354112283852803784704028385280113541121892352121110528
7129761289083289627249868845416448045416448027249868890832896129761281660944384
884344832674758656236165529647233105925904138240472331059223616552966747586568434483221592276992
952481228847233105921889324236844084232192661263482886612634828844084232192188932423684723310592524812288268703891456
103148873728314887372801416993177603778648473606612634828807935161794566612634828803778648473601416993177603148873728031488737283224446697472
1118320719872201527918592100763959296030229187788806045837557760846417258086484641725808646045837557760302291877888010076395929602015279185921832071987237520834297856
12103817412608124580895129668519492321282283983077376051389619240960822233907855369592728924979282223390785536513896192409602283983077376068519492321281245808951296103817412608425236122042368
135749887467527474853707776448491222466561644467815710724111169539276807400105170698249866806894264329866806894264327400105170698244111169539276801644467815710724484912224665674748537077765749887467524710307813392384
14312136748236843699144753152284044440895488113617776358195231244888498503686248977699700736937346654955110410712533199486976937346654955110462489776997007363124488849850368113617776358195228404444089548843699144753152312136748236851140484831117312
Technical details
Node id
n-47c6353493bc43d8 · revision 0 · JSON
Definition source
derived:basis_map_A013609
Fingerprint
f6-77a7ed3b1d5f257e

Observed on the stored rows ?

  • Degrees: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (affine: slope 1, intercept 0)
  • Palindromic rows: yes
  • γ-positive (gamma_positive): yes
  • Nonnegative coefficients (nonn): yes
  • Only rational roots (rr_by_factors: every nonzero row is a product of linear factors over ℚ): yes

Matches ?

No OEIS matches.

Submission text ?

Atlas rows n = 0, …, ascending powers of x
%e Example
Triangle begins:
  0:         1;
  1:        24,         24;
  2:       336,        672,         336;
  3:      3584,      10752,       10752,        3584;
  4:     32256,     129024,      193536,      129024,       32256;
  5:    258048,    1290240,     2580480,     2580480,     1290240,      258048;
  6:   1892352,   11354112,    28385280,    37847040,    28385280,    11354112,     1892352;
  7:  12976128,   90832896,   272498688,   454164480,   454164480,   272498688,    90832896,    12976128;
  8:  84344832,  674758656,  2361655296,  4723310592,  5904138240,  4723310592,  2361655296,   674758656,   84344832;
  9: 524812288, 4723310592, 18893242368, 44084232192, 66126348288, 66126348288, 44084232192, 18893242368, 4723310592, 524812288;
%F Formula
The row polynomials satisfy n*P(n,x) = (4*n+20+(4*n+20)*x)*P(n-1,x) for n >= 1, with P(0,x) = 1.
%t Mathematica
P[0, x_] := 1;
P[n_, x_] := P[n, x] = Expand[Together[((4*n + 20 + (4*n + 20)*x)*P[n - 1, x])/(n)]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N + 1)); v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((4*n + 20 + (4*n + 20)*x)*v[i - 1])/(n)); 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)

polytool c48629374597

Properties

Proof chains ? JSON

Same fingerprint ?

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.