a(n) = 12^n - n^9.

Terms

a(0) =1a(1) =11a(2) =-368a(3) =-17955a(4) =-241408a(5) =-1704293a(6) =-7091712a(7) =-4521799a(8) =295763968a(9) =4772359863a(10) =60917364224a(11) =740650422997