160 of them.
18" is 1.5', so we can discover the number of square feet in one paver by multiplying 1.5 x 1.5 = 2.25 square feet. To fill an area of 14' x 14', or 196 square feet, you would need 196 / 2.25 = 87 pavers, with room for .11 pavers left over. So to cover it completely, 88 pavers would do the trick.
144.63 pavers
Any reason why it shouldn't be 220, apart from the shape of the area?
4.5 pavers will cover 1 sq foot. So 4.5 x 360 =1620 pavers
160 of them.
18" is 1.5', so we can discover the number of square feet in one paver by multiplying 1.5 x 1.5 = 2.25 square feet. To fill an area of 14' x 14', or 196 square feet, you would need 196 / 2.25 = 87 pavers, with room for .11 pavers left over. So to cover it completely, 88 pavers would do the trick.
You would need 320 pavers to cover 160 square feet with 6x9 pavers, assuming each paver covers 0.5 square feet.
144.63 pavers
Any reason why it shouldn't be 220, apart from the shape of the area?
A 12x12 inch paver is one square foot. So you would need 240 square feet.
288
67 tiles.
118
4.5 pavers will cover 1 sq foot. So 4.5 x 360 =1620 pavers
In theory the answer is 240 tiles but this assumes that the area is "well behaved" and, if not, that you are prepared to use all the offcuts to fill bits in mosaic-style. A shape which in 17 inches wide, for example, will require a lot more pavers.
10