12603671392domain: NAppears in sequencesG.f. A(x) satisfies: A(x) = x*f(A(x),A(x)^2/x) where f(,) is Ramanujan's theta function; i.e., A(x) = x*Sum_{n=-oo,+oo} A(x)^(n*(n+1)/2) * (A(x)^2/x)^(n*(n-1)/2).at n=15A107945