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

Terms

a(0) =0a(1) =-1a(2) =1a(3) =-1a(4) =0a(5) =1a(6) =-2a(7) =2a(8) =-1a(9) =-1a(10) =3a(11) =-4a(12) =3a(13) =0a(14) =-4a(15) =7a(16) =-7a(17) =3a(18) =4a(19) =-11a(20) =14a(21) =-10a(22) =-1a(23) =15a(24) =-25a(25) =24a(26) =-9a(27) =-16a(28) =40a(29) =-49