AutoNumber Set

I am trying to figure how to have my auto number be just that. I have items 1-3 on a row name "Items" and auto number on a row name "ID" If I delete item 2, then there is never a ID 2 because if I make another item 2, it starts at 4, not 2. Any way to fix this asides from deleting the ID row and recreating it?? ;)

AutoNumber Set