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A022685 Expansion of Product_{m>=1} (1-m*q^m)^25. 2
1, -25, 250, -1125, 625, 15495, -54375, -20625, 413325, -246425, -1719150, -854425, 11885650, 13624250, -73600100, -65950175, 191784500, 512802500, 23353075, -2854336325, -2372290275, 4919896900, 19737007600 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

MATHEMATICA

With[{nmax = 50}, CoefficientList[Series[Product[(1 - k*q^k)^25, {k, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 19 2018 *)

PROG

(PARI) m=50; q='q+O('q^m); Vec(prod(n=1, m, (1-n*q^n)^25)) \\ G. C. Greubel, Jul 19 2018

(MAGMA) Coefficients(&*[(1-m*x^m)^25:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 19 2018

CROSSREFS

Sequence in context: A125388 A126546 A023073 * A308492 A042208 A143009

Adjacent sequences:  A022682 A022683 A022684 * A022686 A022687 A022688

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified June 28 12:00 EDT 2022. Contains 354907 sequences. (Running on oeis4.)