Expansion of (1+x)^3/(1-x-2*x^2-x^3+x^4).

Terms

a(0) =1a(1) =4a(2) =9a(3) =19a(4) =40a(5) =83a(6) =173a(7) =360a(8) =749a(9) =1559a(10) =3244a(11) =6751a(12) =14049a(13) =29236a(14) =60841a(15) =126611a(16) =263480a(17) =548307a(18) =1141037a(19) =2374520a(20) =4941421a(21) =10283191a(22) =21399516a(23) =44532799a(24) =92673601a(25) =192855524a(26) =401336009a(27) =835187859a(28) =1738041800a(29) =3616898003