a(n) = 7^n + 1 - 0^n.

Terms

a(0) =1a(1) =8a(2) =50a(3) =344a(4) =2402a(5) =16808a(6) =117650a(7) =823544a(8) =5764802a(9) =40353608a(10) =282475250a(11) =1977326744a(12) =13841287202a(13) =96889010408a(14) =678223072850