\frac{1}{24}-(\frac{-3}{2}\sum_{n= 3}^{\propto }\frac{1}{\left ( n+1 \right ) }+4\sum_{n= 3}^{\propto }\frac{1}{\left ( n+2 \right ) }-\frac{5}{2}\sum_{n= 3}^{\propto }\frac{1}{\left ( n+3 \right ) }