Something

<table border="1">
  <tr>
    <td>Level</td>
	<td>Experience</td>
	</tr><tr><td><?php

function experience($B) {
  $a=0;
  for($x=1; $x<$B; $x++) {
    $a += floor($x+300*pow(2, ($x/7)));
  }
  return floor($a/4);
}

for($B=1;$B<100;$B++) {
	echo 'Level '.$B."</td><td>".experience($B)."</td></tr>\n";
	if($B < 99){
		echo "<tr><td>";
	}
}
?></tr></table>