14125363200domain: NAppears in sequencesExpansion of e.g.f.: exp(arctan(x)-arctanh(x))=1-4/3!*x^3+160/6!*x^6-1440/7!*x^7...at n=14A013462sec(arctan(x)-arctanh(x))=1+160/6!*x^6+691200/10!*x^10+19712000/12!*x^12...at n=7A013466E.g.f.: Product_{k>=1} (1 + x^(4*k-1)/(4*k-1)) / (1 - x^(4*k-1)/(4*k-1)).at n=14A326862