a(n) = Sum_{d|n, d=1 mod 4} d^3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =126a(5) =1a(6) =1a(7) =1a(8) =730a(9) =126a(10) =1a(11) =1a(12) =2198a(13) =1a(14) =126a(15) =1a(16) =4914a(17) =730a(18) =1a(19) =126a(20) =9262a(21) =1a(22) =1a(23) =1a(24) =15751a(25) =2198a(26) =730a(27) =1a(28) =24390a(29) =126