-732809984342domain: ZAppears in sequencesG.f. A(x) satisfies [x^(2*n)] A(x)^(3*n) = 3 and [x^(2*n+1)] A(x)^(3*n+1) = [x^(2*n+1)] A(x)^(3*n+2) for n >= 1.at n=20A377095