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

Terms

a(0) =1a(1) =5a(2) =16a(3) =43a(4) =107a(5) =257a(6) =607a(7) =1422a(8) =3318a(9) =7727a(10) =17978a(11) =41810a(12) =97214a(13) =226014a(14) =525439a(15) =1221519a(16) =2839710a(17) =6601549a(18) =15346765a(19) =35676927a(20) =82938821a(21) =192809396a(22) =448227496a(23) =1042002541a(24) =2422362052a(25) =5631308596a(26) =13091204252a(27) =30433357644a(28) =70748973053