It depends on the size of the tile. The number of 16cm x 16 cm tiles required will be quite different from the number of 16 inch x 16 inch tiles. Unfortunately, you do not specify which.
And, if the tile was 16 ft x 16 ft, then 1 tile would be sufficient!
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Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
76.6 tiles
67 tiles.
157 18 by 18 tiles are needed to cover 352 square feet.
You will need at least 67 tiles. This will cover 150.75 square feet.