Powers of 13: a(n) = 13^n.

Terms

a(0) =1a(1) =13a(2) =169a(3) =2197a(4) =28561a(5) =371293a(6) =4826809a(7) =62748517a(8) =815730721a(9) =10604499373a(10) =137858491849