I've tried about 100 different scenarios and can't seem to get this one:

Find a formula for the general term $\displaystyle a_n$ of the sequence, assuming the pattern of the first few terms continues:

{ $\displaystyle \frac{1}{4}, \frac{2}{9}, \frac{3}{16}, \frac{4}{25}, ...$ }

$\displaystyle a_n$ = ?