a(n) = 9^n mod 7^n.

Terms

a(0) =0a(1) =2a(2) =32a(3) =43a(4) =1759a(5) =8628a(6) =60845a(7) =665254a(8) =2693114a(9) =24238026a(10) =97081413a(11) =1721158464a(12) =5603792461a(13) =22751557747a(14) =495431050944