OFFSET
0,7
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
PROG
(PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, (1-x^k)^eulerphi(k)))
(PARI) N=66; x='x+O('x^N); Vec(exp(-sum(k=1, N, sigma(k^2, 2)/sigma(k^2)*x^k/k)))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Aug 02 2021
STATUS
approved