a(n) = 11^n - n^5.

Terms

a(0) =1a(1) =10a(2) =89a(3) =1088a(4) =13617a(5) =157926a(6) =1763785a(7) =19470364a(8) =214326113a(9) =2357888642a(10) =25937324601a(11) =285311509560