OFFSET
0,5
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..3000
FORMULA
a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * A026007(k).
G.f.: (1/(1 + x))*Product_{k>=1} (1 + x^k/(1 + x)^k)^k. - Ilya Gutkovskiy, Aug 20 2018
MATHEMATICA
nmax = 40; s = CoefficientList[Series[Product[(1+x^k)^k, {k, 1, nmax}], {x, 0, nmax}], x]; Table[Sum[(-1)^(n-k) * Binomial[n, k] * s[[k+1]], {k, 0, n}], {n, 0, nmax}]
CROSSREFS
KEYWORD
sign
AUTHOR
Vaclav Kotesovec, Nov 01 2017
STATUS
approved