12551561domain: NAppears in sequencesNumerator of x-coordinate of (2n)*P where P is the generator for rational points on the curve y^2 + y = x^3 - x.at n=8A028936a(n) = numerator of the X-coordinate of n*P where P is the generator [0,0] for rational points on the curve y^2 + y = x^3 - x.at n=17A028940