a(n) = Sum_{0<d|n, n/d odd} d^5.

Terms

a(0) =1a(1) =32a(2) =244a(3) =1024a(4) =3126a(5) =7808a(6) =16808a(7) =32768a(8) =59293a(9) =100032a(10) =161052a(11) =249856a(12) =371294a(13) =537856a(14) =762744a(15) =1048576a(16) =1419858a(17) =1897376a(18) =2476100a(19) =3201024a(20) =4101152a(21) =5153664a(22) =6436344a(23) =7995392a(24) =9768751a(25) =11881408a(26) =14408200a(27) =17211392a(28) =20511150