Get current Row number inside ArrayFormula

Question

In a Google Docs Spreadsheet, I would expect this formula:

=ARRAYFORMULA(ROW())

to fill the column like:

[   1]
[   2]
[   3]
[   4]         


        

Answer 1

The following may be a little simpler:

=arrayformula(ROW(INDIRECT("A"&ROW()&":A")))

or

=index(ROW(INDIRECT("A"&ROW()&":A")))