27776206851domain: NAppears in sequencesG.f. A(x) satisfies: A(x) = 1/(1 - x*A(x)/(1 - x^3*A(x)^3/(1 - x^5*A(x)^5/(1 - x^7*A(x)^7/(1 - ...))))), a continued fraction.at n=20A301832