arcsin(arctanh(x)+arctan(x))=2*x+8/3!*x^3+336/5!*x^5+32832/7!*x^7...

A013176

arcsin(arctanh(x)+arctan(x))=2*x+8/3!*x^3+336/5!*x^5+32832/7!*x^7...

Terms

    a(0) =2a(1) =8a(2) =336a(3) =32832a(4) =6596352a(5) =2172377088

External references