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

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =5a(6) =14a(7) =20a(8) =48a(9) =75a(10) =165a(11) =274a(12) =571a(13) =988a(14) =1988a(15) =3536a(16) =6953a(17) =12597a(18) =24396a(19) =44745a(20) =85786a(21) =158632a(22) =302104a(23) =561683a(24) =1064945a(25) =1987154a(26) =3756519a(27) =7026408a(28) =13256712a(29) =24835744