69695846400domain: NAppears in sequencesarctanh(arctanh(x)*arctan(x))=2/2!*x^2+448/6!*x^6+2380032/10!*x^10...at n=3A012734Expansion of e.g.f. log(1 + arctan(x)*arctanh(x)) (even powers only).at n=7A296623