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There are dots at coordinates: (1,2), (2,1), (3,3), (4,4)
Since the ''x''-coordinate increases linearly, we can write this in shorthand as the set of all ''y''-coordinates. The position in the set would then be the ''x''-coordinate. Observe: {2,1,3,4} would describe the aforementioned array. This defines a permutation. This makes it easy to communicate the arrays for a given order of ''N''.
==Known arrays==
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