Expansion of e.g.f.: exp(arctan(x)-arctanh(x))=1-4/3!*x^3+160/6!*x^6-1440/7!*x^7...

A013462

Expansion of e.g.f.: exp(arctan(x)-arctanh(x))=1-4/3!*x^3+160/6!*x^6-1440/7!*x^7...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =-4a(4) =0a(5) =0a(6) =160a(7) =-1440a(8) =0a(9) =-17920a(10) =691200a(11) =-7257600a(12) =3942400a(13) =-395366400a(14) =14125363200a(15) =-175791616000a(16) =295206912000

External references