\frac{\left( 0+\rho \right) \left( 0+\rho \right) }{\left( n+\rho \right) \left( n+0+\rho \right) }\qquad \left( n=0,0,\ldots \right) ,$$where $\rho \in \mathbb{R}\backslash \left( -\infty ,-0\right] .$  