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A022691 Expansion of Product_{m>=1} (1-m*q^m)^31. 2
1, -31, 403, -2666, 7254, 17329, -187488, 384865, 916050, -4785594, 267220, 23607058, 8499735, -138349218, -198872750, 1055690151, 1063384258, -4561862102, -6887455628, 9053067640, 53042071422 (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)^31, {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)^31)) \\ G. C. Greubel, Jul 19 2018

(MAGMA) Coefficients(&*[(1-m*x^m)^31:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 19 2018

CROSSREFS

Sequence in context: A142829 A300869 A297019 * A125443 A268137 A089375

Adjacent sequences:  A022688 A022689 A022690 * A022692 A022693 A022694

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 29 04:57 EST 2020. Contains 331335 sequences. (Running on oeis4.)