You need to put the two lists into different cells of your table, which just means that the second list of numbers should be between its own TD tags. That also means that your table will have two columns, so in order to get the stuff at the top centered over the whole table and not just in the first column, you need to add the phrase colspan="2" into the TD tag for that top data cell. That will stretch the top cell over both columns.
There's more basic information about tables here that might be helpful for you! :)