A162718 G.f. is the polynomial (Product_{k=1..26} (1 - x^(3*k)))/(1-x)^26.

1, 26, 351, 3275, 23725, 142155, 733004, 3342079, 13741299, 51711699, 180189789, 586778634, 1799295459, 5228005044, 14469814944, 38320410805, 97478917040, 238976617815, 566281223430, 1300339106805, 2900124541080, 6294942923296

Offset

0,2

Comments

This is a row of the triangle in A162499. Only finitely many terms are nonzero.

Links

G. C. Greubel, Table of n, a(n) for n = 0..1027

Maple

m:=26: seq(coeff(series(mul((1-x^(3*k)), k=1..m)/(1-x)^m, x, n+1), x, n), n=0..21); # Muniru A Asiru, Jul 07 2018

Mathematica

CoefficientList[Series[Times@@(1-x^(3*Range[26]))/(1-x)^26, {x, 0, 50}], x] (* G. C. Greubel, Jul 06 2018 *)

Prog

(PARI) x='x+O('x^50); A = prod(k=1, 26, (1-x^(3*k)))/(1-x)^26; Vec(A) \\ G. C. Greubel, Jul 06 2018
(Magma) m:=50; R<x>:=PowerSeriesRing(Integers(), m); F:=(&*[(1-x^(3*k)): k in [1..26]])/(1-x)^26; Coefficients(R!(F)); // G. C. Greubel, Jul 06 2018

Crossrefs

Sequence in context: A161933 A162368 A225979 * A010978 A022590 A364010

Adjacent sequences: A162715 A162716 A162717 * A162719 A162720 A162721

Keyword

nonn

Author

N. J. A. Sloane, Dec 02 2009

Status

approved