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

Terms

a(0) =1a(1) =-1a(2) =4a(3) =-8a(4) =21a(5) =-49a(6) =120a(7) =-288a(8) =697a(9) =-1681a(10) =4060a(11) =-9800a(12) =23661a(13) =-57121a(14) =137904a(15) =-332928a(16) =803761a(17) =-1940449a(18) =4684660a(19) =-11309768a(20) =27304197a(21) =-65918161a(22) =159140520a(23) =-384199200a(24) =927538921a(25) =-2239277041a(26) =5406093004a(27) =-13051463048a(28) =31509019101a(29) =-76069501249