a(n) = 12^n - n^8.

Terms

a(0) =1a(1) =11a(2) =-112a(3) =-4833a(4) =-44800a(5) =-141793a(6) =1306368a(7) =30067007a(8) =413204480a(9) =5116733631a(10) =61817364224a(11) =742794011807