Expansion of (1-x^2) / (1-x-3*x^2+x^3).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =13a(5) =25a(6) =59a(7) =121a(8) =273a(9) =577a(10) =1275a(11) =2733a(12) =5981a(13) =12905a(14) =28115a(15) =60849a(16) =132289a(17) =286721a(18) =622739a(19) =1350613a(20) =2932109a(21) =6361209a(22) =13806923a(23) =29958441a(24) =65018001a(25) =141086401a(26) =306181963a(27) =664423165a(28) =1441882653a(29) =3128970185