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

Terms

a(0) =1a(1) =1a(2) =-2a(3) =10a(4) =-62a(5) =466a(6) =-4004a(7) =37774a(8) =-383042a(9) =4120768a(10) =-46601144a(11) =550296628a(12) =-6751738736a(13) =85742962300