arctanh(sinh(x)+arctan(x))=2*x+15/3!*x^3+713/5!*x^5+82481/7!*x^7...

A013064

arctanh(sinh(x)+arctan(x))=2*x+15/3!*x^3+713/5!*x^5+82481/7!*x^7...

Terms

    a(0) =2a(1) =15a(2) =713a(3) =82481a(4) =17926289a(5) =6251997081

External references