Algebra Level 4

$\large{ \begin{matrix} 1 & & & \\ 2 & 3 & & \\ 4 & 5 & 6 & \\ 7 & 8 & 9 & 10 \\ \vdots \end{matrix}}$

Natural numbers $1,2,3,\ldots$ are placed in a triangle as shown in the above figure. Determine the sum of the numbers in the $2016^{\text{th}}$ row.