start | run | cmd [enter]

for %a in (2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19) do xcopy "c:\documents and settings\%username%\desktop\a1" "c:\documents and settings\%username%\desktop\a%a" /h /s /e /i /c

Assuming you're using XP (or else change the path). if you want to put that in a batch file, replace %a with %%a throughout. if you need literally hundreds of these folders, use excel to make a csv file to populate what's in the brackets