\begin{equation} \sum_{\frac{n}{2}>5} n^2 \end{equation} \begin{equation} \sum_{\genfrac{}{}{}{}{n}{2}>5} n^2 \end{equation} \begin{equation} \genfrac{(}{)}{}{}{n}{2}>5 \end{equation} \begin{equation} \left(\frac{n}{2}\right)>5 \end{equation} \begin{equation} \sum_{\left(\frac{n}{2}\right)>5} n^2 \end{equation} \begin{equation} \sum_{\genfrac{(}{)}{}{}{n}{2}>5} n^2 \end{equation}