6003501630domain: NAppears in sequencesG.f. satisfies: A(x) = 1 + (eta(x^2*A(x)^2)^10 / (eta(x*A(x))^4 * eta(x^4*A(x)^4)^4) - 1)/4, where eta(q) is the Dedekind eta function without the q^(1/24) factor.at n=21A202135