13000018109domain: NAppears in sequencesG.f. A(x) satisfies: A(x) = x + A(x)^2 - R(A(x)^2) + sqrt( A(x)^2 - R(A(x)^2) ), where R(A(x)) = x, and A(x) = Sum_{n>=1} a(n)*x^n/2^A274715(n).at n=18A274714