a(n) = 1^n + 2^n + ... + 9^n.

Terms

a(0) =9a(1) =45a(2) =285a(3) =2025a(4) =15333a(5) =120825a(6) =978405a(7) =8080425a(8) =67731333a(9) =574304985a(10) =4914341925a(11) =42364319625a(12) =367428536133