OFFSET
0,3
FORMULA
G.f.: g(x*g(x)), where g(x) = g.f. of A000009.
MATHEMATICA
nmax = 33; CoefficientList[Series[Product[(1 + x^j Product[(1 + x^k)^j, {k, 1, nmax}]), {j, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 15 2019
STATUS
approved