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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =70a(6) =255a(7) =959a(8) =3696a(9) =14520a(10) =57930a(11) =234080a(12) =955999a(13) =3939949a(14) =16364985a(15) =68437033a(16) =287910048a(17) =1217627176a(18) =5173854018a(19) =22077273858a(20) =94564541166a(21) =406451008386