Does the Table Describe a Function

True/False

Does the table describe a function?
$\begin{array}{|c|c|c|c|c|c|}\hline \text { Input value } & 5 & 10 & 13 & 10 & 5 \\\hline \text { Output value } & -13 & -9 & 0 & 9 & 13 \\\hline\end{array}$