const  N16 = 16;

document.write( '<table border="2px"><tr>' );
document.write( "<th>DEC</th>" );
for( let i = 0 ; i < N16 ; i++ )
{
	document.write( "<th>" + i + "</th>" );
}
document.write( "<th></th></tr>" );

for( let i = 0 ; i < N16 ; i++)
{
	document.write("<tr><th>" + i*N16 + "</th>");
	for( let j = 0 ; j < N16 ; j++ )
	{
		document.write("<td>" + (i*N16+j).toString(16) + "</td>");
	}
	document.write("<th>" + (i+N16).toString(16) + "</th></tr>");
}

document.write("<tr><th></th>");
for( let i = 0; i < N16; i++ )
{
	document.write("<th>" + i + "</th>");
}
document.write("<th>HEX</th></tr>");
document.write("</table>");