a(n) = n*7^n + 1.

Terms

a(0) =1a(1) =8a(2) =99a(3) =1030a(4) =9605a(5) =84036a(6) =705895a(7) =5764802a(8) =46118409a(9) =363182464a(10) =2824752491a(11) =21750594174a(12) =166095446413