A085881 → basis A007318 → reverse

nonnegative coefficientsonly rational roots

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

Recurrence

\(P_{n}(x) = \left(-1 - 2\,x + 2\,n + 4\,n x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 1\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
011
1123
23121227
31590180120405
41058402520336016808505
5945945037800756007560030240229635
6103951247406237001663200249480019958406652807577955
71351351891890113513403783780075675600908107206054048017297280295540245
8202702532432400227026800908107200227026800036324288003632428800207567360051891840013299311025
934459425620269650496215720023156733600694702008001389404016001852538688001587890304007939451520017643225600678264862275
1065472907513094581500117851233500628539912000219988969200052797352608008799558768000100566385920007542478944000335221286400067044257280038661097149675
111374931057530248483265030248483265001814908995900072596359836000203269807540800406539615081600580770878688000580770878688000387180585792000154872234316800281585880576002435649120429525
1231623414322575896194374008348581381140055657209207600025045744143420008014638125894400187008222937536003205855250357760040073190629472000356206138928640002137236833571840077717703038976001295295050649600168059789309637225
13790585358062520555219309625024666263171550001808859299247000090442964962350000325594673864460000868252463638560000173650492727712000026047573909156800002894174878795200000231533990303616000012629126743833600004209708914611200006476475253248000012604484198222791875
142134580466768755976825306952500776987289903825006215898319230600003418744075576830000136749763023073200004102492890692196000093771266072964480000164099715627687840000218799620836917120000218799620836917120000159126996972303360000795634984861516800002448107645727744000034972966367539200001020963220056046141875
Technical details
Node id
n-ec2d40ae4d2a6c1e · revision 0 · JSON
Definition source
derived:reversal
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:        1;
  1:        1,         2;
  2:        3,        12,         12;
  3:       15,        90,        180,         120;
  4:      105,       840,       2520,        3360,        1680;
  5:      945,      9450,      37800,       75600,       75600,        30240;
  6:    10395,    124740,     623700,     1663200,     2494800,      1995840,       665280;
  7:   135135,   1891890,   11351340,    37837800,    75675600,     90810720,     60540480,     17297280;
  8:  2027025,  32432400,  227026800,   908107200,  2270268000,   3632428800,   3632428800,   2075673600,   518918400;
  9: 34459425, 620269650, 4962157200, 23156733600, 69470200800, 138940401600, 185253868800, 158789030400, 79394515200, 17643225600;
%F Formula
The row polynomials satisfy P(n,x) = (2*n-1+(4*n-2)*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[(2*n - 1 + (4*n - 2)*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] = 1; for(n = 1, N, my(i = n + 1); v[i] = (2*n - 1 + (4*n - 2)*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

Candidate equalities ?

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.