a(n) = 8^n mod 7^n.

Terms

a(0) =0a(1) =1a(2) =15a(3) =169a(4) =1695a(5) =15961a(6) =26846a(7) =450066a(8) =5247614a(9) =13156907a(10) =226316077a(11) =680627620a(12) =13354327932a(13) =65310761853a(14) =328708074010