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/usr/share/source-highlight/htmltablelinenum.outlang is in libsource-highlight-common 3.1.8-1.2.

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# this output format must be used with line numbers

include "html_common.outlang"

# line numbers are in a separate column (and start the column for the code)
linenum "<td style=\"vertical-align: top;\">$text</td><td>"

lineprefix "<tr>"

doctemplate
"<table  BGCOLOR=\"$docbgcolor\" 
	style=\"text-align: left; width: 100%;\" border=\"0\"
 	cellpadding=\"2\" cellspacing=\"2\"
 	NOSAVE >
<tbody>
<pre><tt>"
"</tt></pre>
</tbody>
</table>
"
end

nodoctemplate
"<table  BGCOLOR=\"$docbgcolor\" 
	style=\"text-align: left; width: 100%;\" border=\"0\"
 	cellpadding=\"2\" cellspacing=\"2\"
 	NOSAVE >
<tbody>
<pre><tt>"
"</tt></pre>
</tbody>
</table>
"
end

# terminate each line by closing the table column and the table row
translations
"\n" "</td></tr>\n"
end