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

Terms

a(0) =1a(1) =-2a(2) =4a(3) =-10a(4) =27a(5) =-72a(6) =189a(7) =-494a(8) =1292a(9) =-3382a(10) =8855a(11) =-23184a(12) =60697a(13) =-158906a(14) =416020a(15) =-1089154a(16) =2851443a(17) =-7465176a(18) =19544085a(19) =-51167078a(20) =133957148a(21) =-350704366a(22) =918155951a(23) =-2403763488a(24) =6293134513a(25) =-16475640050a(26) =43133785636a(27) =-112925716858a(28) =295643364939a(29) =-774004377960