CPM Homework Help : PC Problem 8-75

Compute the first five terms of the recursively defined sequence.

$t_{n+1} = t_{n} + 2n + 1$ ; $t_{1} = 1$

Hint:

$t = 1$
If $n = 1$ , then...
$t_{1+1} = t_{1} + 2\left(1\right) + 1\\t_{2} = 1 + 2\left(1\right) + 1\\t_{2} = 4$
Now what if $n = 2$ , $3$ , or $4$ ?