A136572 → basis A013609 → basis A013610

nonnegative coefficientsonly rational roots

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

Recurrence

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

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
011
1369
2187272162
3162972194412964374
4194415552466566220831104157464
5291602916001166400233280023328009331207085880
65248806298560314928008398080012597120010077696033592320382637520
7110224801543147209258883203086294400617258880074071065604938071040141087744024106163760
8264539520423263232029628426240118513704960296284262400474054819840474054819840270888468480677221171201735643790720
971425670401285662067201028529653760479980505088014399415152640287988303052803839844040704032912948920320164564744601603656994324480140587147048320
102142770112004285540224000385698620160002057059307520007199707576320001727929818316800287988303052800032912948920320002468471169024000109709829734400021941965946880012652843234348800
117071141369600155565110131200155565110131200093339066078720003733562643148800010453975400816640020907950801633280029868501145190400029868501145190400019912334096793600079649336387174400144816975249408001252631480200531200
1225456108930560061094661433344006720412757667840044802751717785600020161238273003520006451596247361126400150537245771759616002580638498944450560032257981236805632000286737610993827840001720425665962967040062560933307744256001042682221795737600135284199861657369600
1399278824829184002581249445558784003097499334670540800227149951209172992001135749756045864960004088699121765113856001090319765804030361600218063953160806072320032709592974120910848003634399219346767872000290751937547741429760015859196593513168896005286398864504389632008132921330006753280015828251383813912243200
14416971064282572800116751897999120384001517774673988564992001214219739190851993600667820856554968596480026712834262198743859200801385027865962315776001831737206550771007488003205540111463849263104004274053481951799017472004274053481951799017472003108402532328581103616001554201266164290551808004782157742043970928640068316539172056727552001994359674360552942643200
Technical details
Node id
n-9adeec4a52d3b5a6 · revision 0 · JSON
Definition source
derived:basis_map_A013610
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:          3,            6;
  2:         18,           72,            72;
  3:        162,          972,          1944,          1296;
  4:       1944,        15552,         46656,         62208,          31104;
  5:      29160,       291600,       1166400,       2332800,        2332800,         933120;
  6:     524880,      6298560,      31492800,      83980800,      125971200,      100776960,       33592320;
  7:   11022480,    154314720,     925888320,    3086294400,     6172588800,     7407106560,     4938071040,     1410877440;
  8:  264539520,   4232632320,   29628426240,  118513704960,   296284262400,   474054819840,   474054819840,   270888468480,    67722117120;
  9: 7142567040, 128566206720, 1028529653760, 4799805050880, 14399415152640, 28798830305280, 38398440407040, 32912948920320, 16456474460160, 3656994324480;
%F Formula
The row polynomials satisfy P(n,x) = (3*n+6*n*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[(3*n + 6*n*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] = (3*n + 6*n*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.