G.f. satisfies x = A(x)*(1+A(x))/(1-A(x)-(A(x))^2).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =1a(4) =1a(5) =-4a(6) =3a(7) =8a(8) =-23a(9) =10a(10) =67a(11) =-153a(12) =9a(13) =586a(14) =-1081a(15) =-439a(16) =5249a(17) =-7734a(18) =-7941a(19) =47501a(20) =-53791a(21) =-105314a(22) =430119a(23) =-343044a(24) =-1249799a(25) =3866556a(26) =-1730017a(27) =-13996097a(28) =34243897a(29) =-1947204