OFFSET
0,3
FORMULA
G.f.: g(g(x) - 1), where g(x) = g.f. of A000219 (number of planar partitions).
MATHEMATICA
nmax = 25; CoefficientList[Series[Product[1/(1 - (-1 + Product[1/(1 - x^k)^k, {k, 1, nmax}])^j)^j, {j, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 02 2019
STATUS
approved