Expansion of g.f. (1+3*x)/((1-x)*(1+3*x+4*x^2)).

Terms

a(0) =1a(1) =1a(2) =-3a(3) =9a(4) =-11a(5) =1a(6) =45a(7) =-135a(8) =229a(9) =-143a(10) =-483a(11) =2025a(12) =-4139a(13) =4321a(14) =3597a(15) =-28071a(16) =69829a(17) =-97199a(18) =12285a(19) =351945a(20) =-1104971a(21) =1907137a(22) =-1301523a(23) =-3723975a(24) =16378021a(25) =-34238159a(26) =37202397a(27) =25345449a(28) =-224845931a(29) =573156001