G.f. satisfies: A(A(x))^2 = x^2 + 4*A(x)^3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =-5a(5) =6a(6) =57a(7) =-68a(8) =-996a(9) =1151a(10) =23487a(11) =-26316a(12) =-703858a(13) =769268a(14) =25912425a(15) =-27791388a(16) =-1146924362a(17) =1212941187a(18) =60112150656a(19) =-62911402588