a(n) = Sum_{d|n, d odd} d^(d+1).

Terms

a(0) =1a(1) =1a(2) =82a(3) =1a(4) =15626a(5) =82a(6) =5764802a(7) =1a(8) =3486784483a(9) =15626a(11) =82a(13) =5764802a(15) =1a(17) =3486784483a(19) =15626