The figure shows the graph of an exponential function. The dots on the graph are points with integer coordinates.

The function graphed is $f(t) =$ .

Hint: The function may be written as $f(t) = y_0 a^{(t-t_0)/h}$, where $y_0$, $t_0$, and $h$, are integers. Note that $f(t + h) = a f(t)$ for all $t$.