How many squares are drawn by the following code segment?

$```$

def tSquare$($width$,$ x$,$ y$,$ canvas$)$ :

canvas.drawRect$($x$,$ y$,$ width, width$)$

if width $>=4$ :

tSquare$($width $/2,$ x$,$ y$,$ canvas$)$

tSquare$($width $/2,$ x $+$ width $/2,$ y$,$ canvas$)$

tSquare$($width $/2,$ x$,$ y $+$ width $/2,$ canvas$)$

tSquare$($width $/2,$ x $+$ width $/2,$ y $+$ width $/2,$ canvas$)$

# Code to setup the canvas has been omitted

tSquare$(0,0,16,$ canvas$)$

$```$

$16$

$1$

$4$

$8$