a(n) = 11^n - 4^n + 1^n.

Terms

a(0) =1a(1) =8a(2) =106a(3) =1268a(4) =14386a(5) =160028a(6) =1767466a(7) =19470788a(8) =214293346a(9) =2357685548a(10) =25936376026a(11) =285307476308