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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =24a(6) =64a(7) =167a(8) =460a(9) =1256a(10) =3532a(11) =9910a(12) =28280a(13) =80756a(14) =232984a(15) =673371a(16) =1958982a(17) =5710900a(18) =16722156a(19) =49061276a(20) =144387320a(21) =425674212a(22) =1257774336a(23) =3721938064a(24) =11032243612a(25) =32740524236a(26) =97287632048a(27) =289369653892