a(n) = Sum_{d|n} sigma(d)^3.

Terms

a(0) =1a(1) =28a(2) =65a(3) =371a(4) =217a(5) =1820a(6) =513a(7) =3746a(8) =2262a(9) =6076a(10) =1729a(11) =24115a(12) =2745a(13) =14364a(14) =14105a(15) =33537a(16) =5833a(17) =63336a(18) =8001a(19) =80507a(20) =33345a(21) =48412a(22) =13825a(23) =243490a(24) =30008a(25) =76860a(26) =66262a(27) =190323a(28) =27001a(29) =394940