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

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =37a(5) =98a(6) =257a(7) =674a(8) =1765a(9) =4622a(10) =12101a(11) =31682a(12) =82945a(13) =217154a(14) =568517a(15) =1488398a(16) =3896677a(17) =10201634a(18) =26708225a(19) =69923042a(20) =183060901a(21) =479259662a(22) =1254718085a(23) =3284894594a(24) =8599965697a(25) =22515002498a(26) =58945041797a(27) =154320122894a(28) =404015326885