a(n) = 12^n - n^10.

Terms

a(0) =1a(1) =11a(2) =-880a(3) =-57321a(4) =-1027840a(5) =-9516793a(6) =-57480192a(7) =-246643441a(8) =-643760128a(9) =1672995951a(10) =51917364224a(11) =717070946087