Inserting Sequential Numbers Into A Column

I have a column of an undefined number of rows where I need to add item numbers from 1 to however many items there are, starting from A9 downwards.

The last 3 used rows on the sheet contain signatures etc so it should not number the bottom 3 rows.

pretty sure its fairly simple code but i dont have anything similar from previous files that i can re-use to do this :p

just needs a simple

count how many rows are blank from A9 downwards (to say A200)
for num=1 to count do
Cell range(A(9+num) = num
end

i just dont know the code well enough to write it and make it work :p