Brush Loads

Looking at smallest numbers of BL's for different numbers of cubes we'll probably have something like:

So for 5, 6, 7, 8, 9, 10, 11, 12 cubes the smallest numbers are 15, 16, 19, 20, 21, 24, 25, 26.

Looking at the largest numbers we use towers like:

Which some of the children see as 4 times the number of cubes plus 1. So for 5, 6, 7, 8, 9, 10, 11, 12 cubes the largest numbers are 21, 25, 29, 33, 37, 41, 45, 49.