0,3

a(n) = (1/n)*Sum_{k=1..n} sigma_2(k^2)*a(n-k) for n>0, with a(0) = 1.

Cf. A001157, A156303.

Sequence in context: A027086 A075985 A139933 this_sequence A079304 A118572 A092445

Adjacent sequences: A156730 A156731 A156732 this_sequence A156734 A156735 A156736

nonn

Paul D. Hanna and Vladeta Jovovic (vladeta(AT)eunet.yu), Feb 14 2009