Expansion of 1/(1-x*(1-3*x)).

Terms

a(0) =1a(1) =1a(2) =-2a(3) =-5a(4) =1a(5) =16a(6) =13a(7) =-35a(8) =-74a(9) =31a(10) =253a(11) =160a(12) =-599a(13) =-1079a(14) =718a(15) =3955a(16) =1801a(17) =-10064a(18) =-15467a(19) =14725a(20) =61126a(21) =16951a(22) =-166427a(23) =-217280a(24) =282001a(25) =933841a(26) =87838a(27) =-2713685a(28) =-2977199a(29) =5163856