a(0) = 0, a(n) = 13^(n-1) + 1.

Terms

a(0) =0a(1) =2a(2) =14a(3) =170a(4) =2198a(5) =28562a(6) =371294a(7) =4826810a(8) =62748518a(9) =815730722a(10) =10604499374a(11) =137858491850