Generalized Fibonacci numbers.

Terms

a(0) =1a(1) =1a(2) =12a(3) =133a(4) =1475a(5) =16358a(6) =181413a(7) =2011901a(8) =22312324a(9) =247447465a(10) =2744234439a(11) =30434026294a(12) =337518523673