282368domain: NAppears in sequencesG.f. satisfies: A(x) = A(x^2)^2 + x*A(x)^2.at n=11A182144G.f. satisfies: A(x) = ( A(x^2) + x*A(x) )^2.at n=10A182325Coefficients arising in the enumeration of configurations of linear chains.at n=9A323063Product_{n>=1} 1 / (1 - a(n)*x^n/n!) = 1 + tanh(x).at n=9A353912