473335781532domain: NAppears in sequencesG.f.: A(x) = (1+x) + x*A_2(x)^2; A_2(x) = (1+x)^2 + x*A_3(x)^2; ...; A_{n}(x) = (1+x)^n + x*A_{n+1}(x)^2 for n>=1 with A(x) = A_1(x).at n=15A138295