a(n) = sigma_3(n^3)/sigma(n^3).

Terms

a(0) =1a(1) =39a(2) =511a(3) =2359a(4) =12621a(5) =19929a(6) =101179a(7) =149943a(8) =368089a(9) =492219a(10) =1611831a(11) =1205449a(12) =4457701a(13) =3945981a(14) =6449331a(15) =9588151a(16) =22722609a(17) =14355471a(18) =44576623a(19) =29772939a(20) =51702469a(21) =62861409a(22) =141611691a(23) =76620873a(24) =196890121a(25) =173850339a(26) =268218727a(27) =238681261a(28) =574336533a(29) =251523909