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

Terms

a(0) =1a(1) =-2a(2) =5a(3) =-12a(4) =29a(5) =-70a(6) =169a(7) =-408a(8) =985a(9) =-2378a(10) =5741a(11) =-13860a(12) =33461a(13) =-80782a(14) =195025a(15) =-470832a(16) =1136689a(17) =-2744210a(18) =6625109a(19) =-15994428a(20) =38613965a(21) =-93222358a(22) =225058681a(23) =-543339720a(24) =1311738121a(25) =-3166815962a(26) =7645370045a(27) =-18457556052a(28) =44560482149a(29) =-107578520350