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

Terms

a(0) =1a(1) =5a(2) =19a(3) =65a(4) =210a(5) =654a(6) =1985a(7) =5911a(8) =17345a(9) =50305a(10) =144516a(11) =411900a(12) =1166209a(13) =3283145a(14) =9197455a(15) =25655489a(16) =71293590a(17) =197452746a(18) =545222465a(19) =1501460635a(20) =4124739581a(21) =11306252545a(22) =30928921224a(23) =84451726200a(24) =230204999425