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A170813
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Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique.
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0
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1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 12828, 17252, 19612, 21104, 19760, 20392, 20128, 20636, 22408, 23988
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