arctanh(tan(sinh(x)))=x+5/3!*x^3+121/5!*x^5+7069/7!*x^7+763057/9!*x^9...

A012156

arctanh(tan(sinh(x)))=x+5/3!*x^3+121/5!*x^5+7069/7!*x^7+763057/9!*x^9...

Terms

    a(0) =1a(1) =5a(2) =121a(3) =7069a(4) =763057a(5) =132103157a(6) =33527321257

External references