A022651 Expansion of Product_{m>=1} (1+m*q^m)^23.

1, 23, 299, 2898, 23184, 161253, 1006250, 5751679, 30558053, 152543797, 721432513, 3253563394, 14065808815, 58544010641, 235435351628, 917591584210, 3474891526923, 12815003028813, 46113476682975

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

Mathematica

With[{nmax=50}, CoefficientList[Series[Product[(1+m*q^m)^23, {m, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 18 2018 *)

Prog

(PARI) m=50; q='q+O('q^m); Vec(prod(n=1, m, (1+n*q^n)^23)) \\ G. C. Greubel, Jul 18 2018
(Magma) Coefficients(&*[(1+m*x^m)^23:m in [1..40]])[1..50] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 18 2018

Crossrefs

Sequence in context: A086943 A131273 A023021 * A267266 A077504 A086558

Adjacent sequences: A022648 A022649 A022650 * A022652 A022653 A022654

Keyword

nonn

Author

N. J. A. Sloane

Status

approved