a(n) = 14^(2*n+1) + 3^(2*n+1).A138199a(n) = 14^(2*n+1) + 3^(2*n+1).Terms a(0) =17a(1) =2771a(2) =538067a(3) =105415691a(4) =20661066467External referencesoeis: A138199