13 Rows Are Quite A Lot!

Algebra Level 2

12345678910111213141516\begin{array}{c}& & & & 1& & \\ & & 2 & 3 & 4 & & \\ & 5 & 6 & 7 & 8 & 9 & \\ 10 & 11 & 12 & 13 & 14 & 15 & 16 \\ &&& \vdots &&& \end{array}

Given that the pattern continues, find the second term in the 13th13^\text{th} row.

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