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

Terms

a(0) =1a(1) =8a(2) =27a(3) =64a(4) =126a(5) =216a(6) =343a(7) =512a(8) =730a(9) =1008a(10) =1331a(11) =1728a(12) =2198a(13) =2744a(14) =3402a(15) =4096a(16) =4914a(17) =5840a(18) =6859a(19) =8064a(20) =9262a(21) =10648a(22) =12167a(23) =13824a(24) =15751a(25) =17584a(26) =19710a(27) =21952a(28) =24390a(29) =27216