If the tiles are 12 inches x 12 inches then you will need just one.
While that is true in mathematical terms, in real life, it could depend on the shape of the 1 square foot. You may be required to cut the tile and use all the offcuts. That would be quite difficult if any of the cuts are curved.
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18*18 = 324 tiles.
256 tiles
16 square tiles
each tile is one square foot so you need 55 tiles
A square foot is 12" x 12" space. You have 4 ea of 6"x6" tiles in a square foot.