basis-map coefficients of A112227 → basis A013609 → basis A013610

nonnegative coefficientsonly rational roots

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

Recurrence

\(P_{n}(x) = \left(3 + 6\,x\right)\,P_{n-1}(x)\)
\(P_{1}(x) = 9 + 36\,x + 36\,x^{2}\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14x15x16Pn(1)
19363681
227162324216729
3816481944259212966561
4243243097201944019440777659049
572987484374011664017496013996846656531441
6218730618183708612360122472014696649797762799364782969
765611049767348322939328734832011757312117573126718464167961643046721
8196833542942834352132269763968092879361856105815808906992644534963210077696387420489
95904911809801062882056687040198404640476171136793618560906992640680244480302330880604661763486784401
1017714738972343897234023383404093533616026189412485237882496748268928074826892804988459520199538380836279705631381059609
11531441127545841403004249353361604209012720134688407043142729497653875362816673442035205986151424035916908544130606940162176782336282429536481
121594323414523984974287763647811024182390551206566059843217509492915235018985830452528478745658364976384046691981107225468353331284894511104130606940162541865828329
134782969133923132174100071613928005728766040315043064161260169192483780482101139149824367699351219249026580162564902658016256356556946636817827847331845485491486727836416409622876792454961
141434890743046721060265409405223002148031338012888013788725670724596241890240118189077177602363781543552036769935121920441239221463044011265649664026741770997760123423558451203526387384320470184984576205891132094649
1543046721137749507220662426080192849310080125352051552060168984744962206196107315263034174494720141826892613120252136697978880352991377170432385081502367744320901251973120197477693521920846332972236802256887925964828211099074561853020188851841
Technical details
Node id
n-4e2b2d6cd8e0ce29 · revision 0 · JSON
Definition source
derived:basis_map_A013610
Fingerprint
f6-11aec07ce60b6d61

Observed on the stored rows ?

  • Degrees: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 (affine: slope 1, intercept 1)
  • 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 = 1, …, ascending powers of x
%e Example
Triangle begins:
   1:      9,      36,       36;
   2:     27,     162,      324,       216;
   3:     81,     648,     1944,      2592,      1296;
   4:    243,    2430,     9720,     19440,     19440,       7776;
   5:    729,    8748,    43740,    116640,    174960,     139968,      46656;
   6:   2187,   30618,   183708,    612360,   1224720,    1469664,     979776,     279936;
   7:   6561,  104976,   734832,   2939328,   7348320,   11757312,   11757312,    6718464,    1679616;
   8:  19683,  354294,  2834352,  13226976,  39680928,   79361856,  105815808,   90699264,   45349632,   10077696;
   9:  59049, 1180980, 10628820,  56687040, 198404640,  476171136,  793618560,  906992640,  680244480,  302330880,   60466176;
  10: 177147, 3897234, 38972340, 233834040, 935336160, 2618941248, 5237882496, 7482689280, 7482689280, 4988459520, 1995383808, 362797056;
%F Formula
The row polynomials satisfy P(n,x) = (3+6*x)*P(n-1,x) for n >= 2, with P(1,x) = 9 + 36*x + 36*x^2.
%t Mathematica
P[1, x_] := 9 + 36*x + 36*x^2;
P[n_, x_] := P[n, x] = Expand[(3 + 6*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N)); v[1] = 9 + 36*x + 36*x^2; for(n = 2, N, my(i = n); v[i] = (3 + 6*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, v[i])))};
T(10)

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. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.