a(n) = 5*a(n-1) + 3*a(n-2) where a(0) = a(1) = 1.

Terms

a(0) =1a(1) =1a(2) =8a(3) =43a(4) =239a(5) =1324a(6) =7337a(7) =40657a(8) =225296a(9) =1248451a(10) =6918143a(11) =38336068a(12) =212434769a(13) =1177182049a(14) =6523214552a(15) =36147618907a(16) =200307738191