OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = -(1/n)*Sum_{k=1..n} sigma_2(3*k)*a(n-k). - Seiichi Manyama, Mar 04 2017
PROG
(PARI) A283243_vec(m)=Vec(exp(sum(n=1, m, -sigma(3*n, 2)*x^n/n)+x*O(x^m))) \\ Yields m+1 terms a(0..m). - M. F. Hasler, Mar 05 2017
CROSSREFS
Cf. exp( Sum_{n>=1} -sigma_k(3*n)*x^n/n ): A185654 (k=1), this sequence (k=2).
KEYWORD
sign
AUTHOR
Seiichi Manyama, Mar 03 2017
STATUS
approved