Sum of n-th powers of odd divisors of n.

Terms

a(0) =1a(1) =1a(2) =28a(3) =1a(4) =3126a(5) =730a(6) =823544a(7) =1a(8) =387440173a(9) =9765626a(10) =285311670612a(11) =531442a(13) =678223072850a(15) =1