a(n) = 8^n mod 6^n.

Terms

a(0) =0a(1) =2a(2) =28a(3) =80a(4) =208a(5) =1664a(6) =28864a(7) =137600a(8) =1660672a(9) =3207680a(10) =45816832a(11) =245602304a(12) =1239224320a(13) =1206665216a(14) =9653321728a(15) =390683230208a(17) =554107535360