130972domain: NAppears in sequencesNumber of points of a Koblitz curve E: y^2 + x*y = x^3 + a*x^2 + 1 over a field with 2^n elements.at n=17A304293G.f. = Phi*F^5, where Phi = g.f. for A028930, F = g.f. for A028959.at n=20A328536