A022686 Expansion of Product_{m>=1} (1-m*q^m)^26.

1, -26, 273, -1326, 1274, 16900, -70369, 4498, 520884, -574470, -2159898, 712062, 16058549, 6811374, -109730712, -34094866, 371654686, 547508416, -667428372, -4233187348, -477050379, 12477952396, 24147501092

Offset: 0

Author

N. J. A. Sloane

Keywords

• sign

Links

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

Programs

Magma

Coefficients(&*[(1-m*x^m)^26:m in [1..40]])[1..40] where x is PolynomialRing(Integers()).1; // G. C. Greubel, Jul 19 2018

Mathematica

With[{nmax = 50}, CoefficientList[Series[Product[(1 - k*q^k)^26, {k, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 19 2018 *)

PARI

m=50; q='q+O('q^m); Vec(prod(n=1,m,(1-n*q^n)^26)) \\ G. C. Greubel, Jul 19 2018