I've got a solution for you, although it might not be the best:
Reserve 2 extra columns.
Enter '1' in G1 and drag it down.
Enter formula in H1:
Confirm this formula by hitting Ctrl+Shift+Enter as this is an array formula.
Drag the formula down ( make sure the number of rows are correct ).
And finally the formula in column E:
Drag the formula down.
Kind of a workaround. Keep in mind that column G and H can be placed out of sight, be hidden , text be made white or placed on a different sheet. To keep the same look.