OFFSET
0,3
LINKS
N. J. A. Sloane, Transforms
FORMULA
a(n) = [x^n] Product_{k>=1} (1 + x^k)^(n^(k-1)).
MATHEMATICA
Table[SeriesCoefficient[Exp[Sum[(-1)^(k + 1) x^k/(k (1 - n x^k)), {k, 1, n}]], {x, 0, n}], {n, 0, 20}]
Table[SeriesCoefficient[Product[(1 + x^k)^(n^(k - 1)), {k, 1, n}], {x, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, May 27 2018
STATUS
approved