OFFSET
0,3
FORMULA
G.f.: p(p(x) - 1), where p(x) = g.f. of A000041 (partitions numbers).
MATHEMATICA
nmax = 28; CoefficientList[Series[Product[1/(1 - (-1 + Product[1/(1 - x^k), {k, 1, nmax}])^j), {j, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Mar 26 2019
STATUS
approved