a(n) = 10^n mod 8^n.

Terms

a(0) =0a(1) =2a(2) =36a(3) =488a(4) =1808a(5) =1696a(6) =213568a(7) =1611392a(8) =16113920a(9) =60475904a(10) =336323584a(11) =5510719488a(12) =37927325696a(13) =104395350016