395366400domain: NAppears in sequencesExpansion of e.g.f. sin(arctan(x) - arctanh(x)) (odd powers only).at n=6A013463E.g.f.: Product_{k>=1} (1 + x^(4*k-1)/(4*k-1)) / (1 - x^(4*k-1)/(4*k-1)).at n=13A326862