Not counting the space for sand between the blocks, it would take
11,520/(area of each block in square inches)blocks.
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162
225
It works out to about 13.1 bags for every inch deepyou're planning on.
Assuming they are 8 inch*16 inch blocks, 144 square feet = 144*12*12 square inches. So number of blocks required = 144*12*12/(8*16) = 162
Depends on the size of the bricks.