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

Terms

a(0) =1a(1) =0a(2) =2a(3) =-2a(4) =5a(5) =-8a(6) =16a(7) =-28a(8) =53a(9) =-96a(10) =178a(11) =-326a(12) =601a(13) =-1104a(14) =2032a(15) =-3736a(16) =6873a(17) =-12640a(18) =23250a(19) =-42762a(20) =78653a(21) =-144664a(22) =266080a(23) =-489396a(24) =900141a(25) =-1655616a(26) =3045154a(27) =-5600910a(28) =10301681a(29) =-18947744