A120909 → basis A013610 → reverse

nonnegative coefficientsonly rational roots

Proved for all n all roots real, in (−∞, −1]coefficients of one signHadamard kernelinterlacing (weak)

Recurrence

\(P_{n}(x) = \left(6 + 3\,x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 3\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
033
118927
210810827243
3648972486812187
4388877765832194424319683
5233285832058320291607290729177147
61399684199045248803499201312202624421871594323
7839808293932844089923674160183708055112491854656114348907
85038848201553923527193635271936220449608817984220449631492819683129140163
9302330881360488962720977923174474242380855681190427843968092885030561062882590491162261467
10181398528906992640204073344027209779202380855680142851340859521392017006112031886460354294017714710460353203
111088391168598615142414965378560224480678402244806784015713647488785682374428060084807015021201169170201169170253144194143178827
126530347008391820820481077507256321795845427202020326105601616260884489428188492840406522112126270381602806008480420901272382637521594323847288609443
133918208204825468353331276405059993614007594332161750949291520157585436236810505695749125252847874561969817952965471716536010943433072149228632812435719447829697625597484987
142350924922881645647446016534835419955210696708399104147079740487681470797404876811030980536576630341744947227577451341449192483780482298120945124178401718452230021484017693961434890768630377364883
Technical details
Node id
n-db0f883a735747d6 · revision 0 · JSON
Definition source
derived:shift_x_plus_one
Fingerprint
f6-11aec07ce60b6d61

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: no
  • γ-positive (gamma_positive): no
  • 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:        3;
  1:       18,         9;
  2:      108,       108,        27;
  3:      648,       972,       486,        81;
  4:     3888,      7776,      5832,      1944,       243;
  5:    23328,     58320,     58320,     29160,      7290,       729;
  6:   139968,    419904,    524880,    349920,    131220,     26244,     2187;
  7:   839808,   2939328,   4408992,   3674160,   1837080,    551124,    91854,    6561;
  8:  5038848,  20155392,  35271936,  35271936,  22044960,   8817984,  2204496,  314928,   19683;
  9: 30233088, 136048896, 272097792, 317447424, 238085568, 119042784, 39680928, 8503056, 1062882, 59049;
%F Formula
The row polynomials satisfy P(n,x) = (6+3*x)*P(n-1,x) for n >= 1, with P(0,x) = 3.
%t Mathematica
P[0, x_] := 3;
P[n_, x_] := P[n, x] = Expand[(6 + 3*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N + 1)); v[1] = 3; for(n = 1, N, my(i = n + 1); v[i] = (6 + 3*x)*v[i - 1]); 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.