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
CROSSREFS
Cf. exp( Sum_{n>=1} sigma_k(3*n)*x^n/n ): A182819 (k=1), this sequence (k=2).
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 03 2017
STATUS
approved