A022688 Expansion of Product_{m>=1} (1-m*q^m)^28.

1, -28, 322, -1792, 3059, 18788, -109970, 96232, 739669, -1676136, -2594074, 6667864, 22486226, -26768980, -188468912, 174822312, 845108712, -60897844, -3216451658, -5497042096, 11876402839, 31175102772

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)^28, {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)^28)) \\ G. C. Greubel, Jul 19 2018
(Magma) Coefficients(&*[(1-m*x^m)^28:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 19 2018

Crossrefs

Sequence in context: A334882 A196513 A042520 * A125416 A241038 A055753

Adjacent sequences: A022685 A022686 A022687 * A022689 A022690 A022691

Keyword

sign

Author

N. J. A. Sloane

Status

approved