a(0) = 1, a(1) = 5, a(n+1) = 5*a(n) + a(n-1).

Terms

a(0) =1a(1) =5a(2) =26a(3) =135a(4) =701a(5) =3640a(6) =18901a(7) =98145a(8) =509626a(9) =2646275a(10) =13741001a(11) =71351280a(12) =370497401a(13) =1923838285a(14) =9989688826a(15) =51872282415a(16) =269351100901