Joe, You can easily do that in Google Sheets then export back out as a csv file to import into ART. Or use any spreadsheet program like Excel, Pages on Mac or OpenOffice Calc.
The procedure i use: Put the beginning number in one cell then in the cell immediately under it, use the formula =A1+1. With A1 being the actual cell above. Then you simply copy and paste the formula cell down the column and it will increment the numbers automatically.
If you have Excel -
here's a video that shows you how to do it using a built-in tool.