Код:
<html>
<body>
<table style=width:100%;height:100% border=2 cellspacing=3 cellpadding=3 >
	<tr align=center>
    <td>1</td>
    <td>2</td>
    <td>3</td>
    <td>4</td>
    <td>5</td>
    <td>6</td>
	</tr>
	<tr>
    <td>7</td>
    <td colspan="2" rowspan="3">8</td>
    <td colspan="2" rowspan="3">9</td>
    <td>10</td>
	</tr>
	<tr>
    <td>11</td>
    <td>12</td>
	</tr>
	<tr>
    <td>13</td>
    <td>14</td>
	</tr>
	<tr>
    <td>15</td>
    <td colspan="2">16</td>
    <td colspan="2">17</td>
    <td>18</td>
	</tr>
</table>
</body>
</html>