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

Terms

a(0) =0a(1) =6a(2) =96a(3) =1206a(4) =14016a(5) =157926a(6) =1755936a(7) =19409046a(8) =213968256a(9) =2355994566a(10) =25927658976a(11) =285262842486