OFFSET
0,3
COMMENTS
Convolution inverse of A000335 (Euler transform of the tetrahedral numbers).
FORMULA
G.f.: Product_{k>=1} (1 - x^k)^(k*(k+1)*(k+2)/6).
MATHEMATICA
nmax = 37; CoefficientList[Series[Product[(1 - x^k)^(k (k + 1) (k + 2)/6), {k, 1, nmax}], {x, 0, nmax}], x]
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, Sep 15 2017
STATUS
approved