arctanh(arctan(x)+arcsin(x))=2*x+15/3!*x^3+721/5!*x^5+84049/7!*x^7...

A012993

arctanh(arctan(x)+arcsin(x))=2*x+15/3!*x^3+721/5!*x^5+84049/7!*x^7...

Terms

    a(0) =2a(1) =15a(2) =721a(3) =84049a(4) =18372769a(5) =6443708601

External references