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

Terms

a(0) =1a(1) =2a(2) =5a(3) =9a(4) =18a(5) =32a(6) =60a(7) =107a(8) =196a(9) =351a(10) =637a(11) =1144a(12) =2068a(13) =3720a(14) =6713a(15) =12086a(16) =21793a(17) =39253a(18) =70754a(19) =127468a(20) =229724a(21) =413907a(22) =745888a(23) =1343979a(24) =2421849a(25) =4363920a(26) =7863640a(27) =14169632a(28) =25532993a(29) =46008618