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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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OFFSET
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1,2
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COMMENTS
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(Empirical) Equals A008404 for n<=2m+2, where m is the maximum difference separation 7.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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