OFFSET
0,15
COMMENTS
Integer partitions into second or "negative" pentagonal numbers (A005449) .
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
MATHEMATICA
nmax = 100; CoefficientList[Series[Product[1/(1 - x^(k*(3*k+1)/2)), {k, 1, nmax}], {x, 0, nmax}], x] (* Vaclav Kotesovec, Dec 10 2017 *)
PROG
(PARI) N=66; x='x+O('x^N); Vec(1/prod(k=1, N, (1-x^(k*(3*k+1)/2))))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Dec 09 2017
STATUS
approved