Generalized Fibonacci numbers.

Terms

a(0) =1a(1) =1a(2) =9a(3) =73a(4) =593a(5) =4817a(6) =39129a(7) =317849a(8) =2581921a(9) =20973217a(10) =170367657a(11) =1383914473a(12) =11241683441a(13) =91317382001a(14) =741780739449