G.f. satisfies: Sum_{n>=0} x^n*A_{n}(x) = x + x^2, where A_{n+1}(x) = A_{n}(A(x)) denotes iteration with A_0(x)=x.

A180023

G.f. satisfies: Sum_{n>=0} x^n*A_{n}(x) = x + x^2, where A_{n+1}(x) = A_{n}(A(x)) denotes iteration with A_0(x)=x.