A022720 Expansion of Product_{m>=1} (1+m*q^m)^-28.

1, -28, 350, -2576, 12593, -45892, 149926, -514504, 1734264, -5142508, 14199108, -40931240, 117876241, -311946824, 796757922, -2104447072, 5482534827, -13518654268, 32992345904, -81755033080, 198688497651

Offset: 0

Author

N. J. A. Sloane

Keywords

• sign

Links

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

Programs

Mathematica

With[{nmax = 50}, CoefficientList[Series[Product[(1 + k*q^k)^-28, {k, 1, nmax}], {q, 0, nmax}], q]] (* G. C. Greubel, Jul 20 2018 *)

PARI

m=50; q='q+O('q^m); Vec(prod(n=1,m,(1+n*q^n)^-28)) \\ G. C. Greubel, Jul 20 2018