Same cell from Multiple tabs

I am after help with pulling the same cell from mulitple tabs/worksheets.

Eg. i have 10 tabs and i want data from cell L20 from each tab to be listed on tab 11 from A1 to A10. but i need to be able to just copy the formula down the A column if i end up adding in more tabs.

My brain just isn't functioning today.

Thanks

Matt