My problems #13(Easiest problem of the set)

Algebra Level 1

Let

tn={n2if n Evenn21if nOddt_n=\begin{cases} n^2&\mbox{if}\ n\in \text{ Even} \\ n^2-1 &\mbox{if}\ n\in \text{Odd} \end{cases}

Find

t19\huge t_{19}

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