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A318482
Expansion of Product_{i>=1, j>=1, k>=1} (1 + i*j*k*x^(i*j*k)).
1
1, 1, 6, 15, 45, 105, 302, 668, 1664, 3830, 8793, 19350, 43265, 92552, 198418, 418128, 869999, 1787964, 3651028, 7353349, 14697367, 29139447, 57225893, 111572329, 216001937, 415000057, 792008753, 1502559866, 2831393559, 5305614223, 9885825732, 18318165218
OFFSET
0,3
MATHEMATICA
nmax = 40; CoefficientList[Series[Product[Product[Product[(1+i*j*k*x^(i*j*k)), {i, 1, nmax}], {j, 1, nmax}], {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Aug 27 2018
STATUS
approved