basis-map coefficients of A127647 → basis A013610

nonnegative coefficientsonly rational roots

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

Recurrence

\(P_{n}(x) = \left(4 + 12\,x + 9\,x^{2}\right)\,P_{n-2}(x) + \left(2 + 3\,x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 1\)
\(P_{1}(x) = 2 + 3\,x\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
011
1235
28241850
32410816281375
480480108010804053125
52561920576086406480194425000
68327488280805616063180379089477203125
7268828224127008317520476280428652214326459271640625
887041044485483521645056308448037013762776032118972822307413281250
928160380160228096079833601796256026943840269438401732104064953901082565107421875
1091136136704092275203691008096888960174400128218000160186857280105107220350357405255361869140625
112949124866048364953601642291204926873601034643456155196518416628198401247114880623557440187067232255091687031250000
1295436817178624141723648708618240239158656057398077441004466355212914567424121074069608071604640363222208899060602412382575356884765625
133088384602234885420113922981062656111789849603018325939260366518784905497781761018685004488489041704050934250224208367387285209184682601059771460205078125
149994240209879040204632064012277923840506464358401519393075203418634419205860516147207691927443207691927443205768945582403146697590401180011596402723103684029176110903723144531250
Technical details
Node id
n-24b6838ef9a856ef · revision 0 · JSON
Definition source
derived:basis_map_A013610
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:     2,      3;
  2:     8,     24,      18;
  3:    24,    108,     162,      81;
  4:    80,    480,    1080,    1080,      405;
  5:   256,   1920,    5760,    8640,     6480,     1944;
  6:   832,   7488,   28080,   56160,    63180,    37908,     9477;
  7:  2688,  28224,  127008,  317520,   476280,   428652,   214326,    45927;
  8:  8704, 104448,  548352, 1645056,  3084480,  3701376,  2776032,  1189728,  223074;
  9: 28160, 380160, 2280960, 7983360, 17962560, 26943840, 26943840, 17321040, 6495390, 1082565;
%F Formula
The row polynomials satisfy P(n,x) = (4+12*x+9*x^2)*P(n-2,x) + (2+3*x)*P(n-1,x) for n >= 2, with P(0,x) = 1, P(1,x) = 2 + 3*x.
%t Mathematica
P[0, x_] := 1;
P[1, x_] := 2 + 3*x;
P[n_, x_] := P[n, x] = Expand[(4 + 12*x + 9*x^2)*P[n - 2, x] + (2 + 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] = 1; v[2] = 2 + 3*x; for(n = 2, N, my(i = n + 1); v[i] = (4 + 12*x + 9*x^2)*v[i - 2] + (2 + 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. [Bra15] Petter Brändén. Unimodality, log-concavity, real-rootedness and beyond. Handbook of enumerative combinatorics, :437–483, March 2015. doi:10.1201/b18255-10
  2. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.