OFFSET
0,19
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
PROG
(PARI) my(N=99, x='x+O('x^N)); Vec(1/sum(k=0, N^(1/4), x^k^4))
(PARI) a(n) = if(n==0, 1, -sum(k=1, n, ispower(k, 4)*a(n-k)));
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Mar 19 2022
STATUS
approved