arctanh(cos(x)*sin(x))=x-2/3!*x^3-40/5!*x^5+208/7!*x^7+64640/9!*x^9...

A012477

arctanh(cos(x)*sin(x))=x-2/3!*x^3-40/5!*x^5+208/7!*x^7+64640/9!*x^9...

Terms

    a(0) =1a(1) =-2a(2) =-40a(3) =208a(4) =64640a(5) =986368a(6) =-652487680a(7) =-60911593472

External references