X-N

<?phpfor($x = 0,print('<table border="1" cellpadding="5" cellspacing="0">');$x < 32;$x++,print('</tr>'),print($x == 32 ? '</table>':''))  for($y = 0,print('<tr>');pow(2,$y) < 32;$y++)    if(!($x%pow(2,$y))) echo '<td width="120" rowspan="'.pow(2,$y).'">'.$x.'</td>';?>