arctanh(arctan(x)*sin(x))=2/2!*x^2-12/4!*x^4+430/6!*x^6-27384/8!*x^8...

A012428

arctanh(arctan(x)*sin(x))=2/2!*x^2-12/4!*x^4+430/6!*x^6-27384/8!*x^8...

Terms

    a(0) =0a(1) =2a(2) =-12a(3) =430a(4) =-27384a(5) =3086458a(6) =-524689220a(7) =126513823462

External references