A085881 → basis A007318 → basis A013609

nonnegative coefficientsonly rational roots

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

Recurrence

\(P_{n}(x) = \left(-3 - 2\,x + 6\,n + 4\,n x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 1\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
011
1325
227361275
34058105401201875
48505226802268010080168065625
52296357654501020600680400226800302402953125
67577955303118205051970044906400224532005987520665280162421875
729554024513791878102758375620306486180020432412008172964801816214401729728010557421875
8132993110257092965880016550253720022067004960018389170800098075577600326918592006227020800518918400791806640625
9678264862275406958917365010852237796400168812587944001688125879440011254172529600500185445760014291012736002381835456001764322560067303564453125
103866109714967525774064766450077322194299350013746167875440001603719585468000128297566837440071276426020800027152924198400067882310496000100566385920006704425728006393838623046875
1124356491204295251786142688314985059538089610499500119076179220999000158768238961332000148183689697243200987891264648288004704244117372800015680813724576000348462527212800046461670295040028158588057600671353055419921875
1216805978930963722513444783144770978004929753819749358600109550084883319080001643251273249786200017528013581331052800136328994521463744007790228258369356800324592844098723200096175657510732800019235131502146560023315310911692800129529505064960077205601373291015625
13126044841982227918751092388630512641962504369554522050567850001068113327612361030000178018887935393505000021362266552247220600001898868137977530720000126591209198502048000063295604599251024000023442816518241120000062514177381976320000113662140694502400001262912674383360000647647525324800009650700171661376953125
141020963220056046141875952899005385643065750041292290233377866182500110112773955674309820000201873418918736234670000269164558558314979560000269164558558314979560000205077758901573317760000119628692692584435360000531683078633708601600001772276928779028672000042964289182521907200007160714863753651200007344322937183232000034972966367539200001302844523174285888671875
Technical details
Node id
n-889c040e1c837318 · revision 0 · JSON
Definition source
derived:basis_map_A013609
Fingerprint
f6-f06e51c139cfae05

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,             2;
  2:           27,            36,             12;
  3:          405,           810,            540,            120;
  4:         8505,         22680,          22680,          10080,           1680;
  5:       229635,        765450,        1020600,         680400,         226800,          30240;
  6:      7577955,      30311820,       50519700,       44906400,       22453200,        5987520,        665280;
  7:    295540245,    1379187810,     2758375620,     3064861800,     2043241200,      817296480,     181621440,      17297280;
  8:  13299311025,   70929658800,   165502537200,   220670049600,   183891708000,    98075577600,   32691859200,    6227020800,    518918400;
  9: 678264862275, 4069589173650, 10852237796400, 16881258794400, 16881258794400, 11254172529600, 5001854457600, 1429101273600, 238183545600, 17643225600;
%F Formula
The row polynomials satisfy P(n,x) = (6*n-3+(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[(6*n - 3 + (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] = (6*n - 3 + (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

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.