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

Terms

a(0) =1a(1) =-2a(2) =4a(3) =-9a(4) =19a(5) =-41a(6) =88a(7) =-189a(8) =406a(9) =-872a(10) =1873a(11) =-4023a(12) =8641a(13) =-18560a(14) =39865a(15) =-85626a(16) =183916a(17) =-395033a(18) =848491a(19) =-1822473a(20) =3914488a(21) =-8407925a(22) =18059374a(23) =-38789712a(24) =83316385a(25) =-178955183a(26) =384377665a(27) =-825604416a(28) =1773314929a(29) =-3808901426