a(n) = 1 + 17^n.A224384a(n) = 1 + 17^n.Terms a(0) =2a(1) =18a(2) =290a(3) =4914a(4) =83522a(5) =1419858a(6) =24137570a(7) =410338674a(8) =6975757442a(9) =118587876498External referencesoeis: A224384