arctan(arctan(x)-arctanh(x))=-4/3!*x^3-1440/7!*x^7+35840/9!*x^9...

A013464

arctan(arctan(x)-arctanh(x))=-4/3!*x^3-1440/7!*x^7+35840/9!*x^9...

Terms

    a(0) =0a(1) =-4a(2) =0a(3) =-1440a(4) =35840a(5) =-7257600a(6) =790732800a(7) =-208797388800

External references