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

Terms

a(0) =1a(1) =-2a(2) =3a(3) =-7a(4) =14a(5) =-27a(6) =55a(7) =-110a(8) =219a(9) =-439a(10) =878a(11) =-1755a(12) =3511a(13) =-7022a(14) =14043a(15) =-28087a(16) =56174a(17) =-112347a(18) =224695a(19) =-449390a(20) =898779a(21) =-1797559a(22) =3595118a(23) =-7190235a(24) =14380471a(25) =-28760942a(26) =57521883a(27) =-115043767a(28) =230087534a(29) =-460175067