OFFSET
0,4
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..52
FORMULA
G.f.: Sum_{k>=0} x^k/(1 + k^k * x).
PROG
(PARI) a(n) = sum(k=0, n, (-1)^(n-k)*k^(k*(n-k)));
(PARI) my(N=20, x='x+O('x^N)); Vec(sum(k=0, N, x^k/(1+k^k*x)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Dec 04 2021
STATUS
approved