How to check sequence numbers in a range of cells

[desktopbbb]

If I would like to store sequence numbers in A1 to A10 as follows :

A1 : 1
A2 : 2
A3 : 3
....

A9 : 9
A10 : 10

How to make sure that A(n) really stores n ?

 

[Phobos]

Fill the range A1:A10 with the following formula:

=ROW()

P