-arctan(sin(x)-arctanh(x))=3/3!*x^3+23/5!*x^5+721/7!*x^7+25199/9!*x^9...

A013391

-arctan(sin(x)-arctanh(x))=3/3!*x^3+23/5!*x^5+721/7!*x^7+25199/9!*x^9...

Terms

    a(0) =0a(1) =3a(2) =23a(3) =721a(4) =25199a(5) =1716121a(6) =141920855a(7) =20103619537

External references