11^n - 6^n + 1.

Terms

a(0) =1a(1) =6a(2) =86a(3) =1116a(4) =13346a(5) =153276a(6) =1724906a(7) =19207236a(8) =212679266a(9) =2347869996a(10) =25876958426a(11) =284948873556