Expansion of 1/(1-3*x-x^3).

Terms

a(0) =1a(1) =3a(2) =9a(3) =28a(4) =87a(5) =270a(6) =838a(7) =2601a(8) =8073a(9) =25057a(10) =77772a(11) =241389a(12) =749224a(13) =2325444a(14) =7217721a(15) =22402387a(16) =69532605a(17) =215815536a(18) =669848995a(19) =2079079590a(20) =6453054306a(21) =20029011913a(22) =62166115329a(23) =192951400293a(24) =598883212792