Do like Below
<c:forEach var="data" items="${list1}" varStatus="loop">
<tr>
<td> ${sno+1} </td>
<c:forEach var="innerData" items="${data}">
<td> ${innerData} </td>
</c:forEach>
<c:set var="sno" value="${sno+1}"/>
</tr>
</c:forEach>