arctanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4+398/6!*x^6-10344/8!*x^8...

A012440

arctanh(arctan(x)*arcsin(x))=2/2!*x^2-4/4!*x^4+398/6!*x^6-10344/8!*x^8...

Terms

    a(0) =0a(1) =2a(2) =-4a(3) =398a(4) =-10344a(5) =2050362a(6) =-188329260a(7) =60987377670

External references