a(n) = 8^n mod 5^n.

Terms

a(0) =0a(1) =3a(2) =14a(3) =12a(4) =346a(5) =1518a(6) =12144a(7) =65902a(8) =370966a(9) =1405228a(10) =9288699a(11) =45012717a(12) =115961111a(13) =439407638a(14) =3515261104a(15) =28122088832a(16) =102906398156a(17) =365487513373