Because of the bonding of the bricks you will have to use 2 rows per brick.
In A1 right click and choose Format Cells - Patterns and choose a pattern.
In B2 do the same as above but with a different pattern.
Now you can copy and paste A1 into A2, A5 & A6, A9 & A10 etc.
Copy and paste B2 into B3, B6 & B7, B10 & B11 etc.
I've used this method and it's easy to take into account half bricks or pillars etc.