Someone please help. I've had two experts try this. The first one got it wrong and the second one gave me the picture that I presented as the answer along with wrong code. This is the code I currently have but it is wrong and I cannot figure it out.

public class SierpinskiSquare $\{$

public static void main$($String$[]$ args$)\{$

int n $=$ Integer.parseInt$($args$[0])$;

StdDraw.setScale$(0,1)$;

sierpinski$($n$,0\mathrm{.}5,0\mathrm{.}5,0\mathrm{.}5)$;

$\}$

public static void sierpinski$($int n$,$ double x$,$ double y$,$ double size$)\{$

double halfSize $=$ size $/2$;

if $($n $==0)\{$

StdDraw.setPenColor$(0,0,0)$;

double$[]$ px $=\{$ x $+$ size, x$,$ x $-$ size, x $\}$;

double$[]$ py $=\{$ y$,$ y $+$ size, y$,$ y $-$ size $\}$;

StdDraw.filledPolygon$($px$,$ py$)$;

return;

$\}$

if $($n $\%2==0)\{$

StdDraw.setPenColor$(0,0,0)$;

double$[]$ px $=\{$ x $+$ size, x$,$ x $-$ size, x $\}$;

double$[]$ py $=\{$ y$,$ y $+$ size, y$,$ y $-$ size $\}$;

StdDraw.filledPolygon$($px$,$ py$)$;

$\}$else$\{$

StdDraw.setPenColor$(125,0,0)$;

StdDraw.filledSquare$($x$,$ y$,$ halfSize$)$;

$\}$

sierpinski$($n $-1,$ x $-$ halfSize, y $-$ halfSize, halfSize$)$;

$\}$

$\}$