arctan(arcsin(arctanh(x))) = x + (1/3!)*x^3 + (17/5!)*x^5 + (673/7!)*x^7 + (54305/9!)*x^9 + ...

A012137

arctan(arcsin(arctanh(x))) = x + (1/3!)*x^3 + (17/5!)*x^5 + (673/7!)*x^7 + (54305/9!)*x^9 + ...

Terms

    a(0) =1a(1) =1a(2) =17a(3) =673a(4) =54305a(5) =7334273a(6) =1497501873a(7) =430436005665

External references