OFFSET
0,3
FORMULA
G.f.: Product_{k>=1} ((1 - x^(3*k)) / (1 - x^k))^A000005(k).
MATHEMATICA
nmax = 41; CoefficientList[Series[Product[((1 - x^(3 k))/(1 - x^k))^DivisorSigma[0, k], {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Nov 21 2019
STATUS
approved