Its (unfortunately) not so simple.
You could use the table in http://www.mainstage.com/Files/LeeColorChartNbr.htm as a reference. In the page HTML there are the numeric (in hex) colours. That would already work fine. Convert hex to decimal.
If you want to approach it professionally there is a table in http://www.leefilters.com/downloads/ass ... ochure.pdf with the exact chromacity and luminance values. If you could put that in the package, it would become a full fledged and advanced design tool for theatrics.
As i mentioned you could be ok only with the colours up to 208. Above that are specials, not commonly used.