arctanh(arcsinh(x)+arctan(x))=2*x+13/3!*x^3+561/5!*x^5+58959/7!*x^7...

A013111

arctanh(arcsinh(x)+arctan(x))=2*x+13/3!*x^3+561/5!*x^5+58959/7!*x^7...

Terms

    a(0) =2a(1) =13a(2) =561a(3) =58959a(4) =11644353a(5) =3689490231

External references