a(n) = 11^n - n^6.

Terms

a(0) =1a(1) =10a(2) =57a(3) =602a(4) =10545a(5) =145426a(6) =1724905a(7) =19369522a(8) =214096737a(9) =2357416250a(10) =25936424601a(11) =285309899050