a(n) = 6^n mod 5^n.

Terms

a(0) =0a(1) =1a(2) =11a(3) =91a(4) =46a(5) =1526a(6) =15406a(7) =45561a(8) =117116a(9) =312071a(10) =1872426a(11) =21000181a(12) =223657336a(13) =853662766a(14) =5121976596a(15) =12421312701a(16) =74527876206a(17) =141991475986