OFFSET
0,3
EXAMPLE
The table of coefficients of x^k in expansion of Product_{k>=1} (1 - x^k)^(n^k) begins:
n = 0: (1), 0, 0, 0, 0, 0, ...
n = 1: 1, (-1), -1, 0, 0, 1, ...
n = 2: 1, -2, (-3), 0, 2, 12, ...
n = 3: 1, -3, -6, (-1), 9, 63, ...
n = 4: 1, -4, -10, -4, (25), 224, ...
n = 5: 1, -5, -15, -10, 55, (624), ...
MATHEMATICA
Table[SeriesCoefficient[Product[(1 - x^k)^(n^k), {k, 1, n}], {x, 0, n}], {n, 0, 20}]
CROSSREFS
KEYWORD
sign
AUTHOR
Ilya Gutkovskiy, Mar 06 2018
STATUS
approved