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A170813 Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique. 0
1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 12828, 17252, 19612, 21104, 19760, 20392, 20128, 20636, 22408, 23988 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
(Empirical) Equals A008404 for n<=2m+2, where m is the maximum difference separation 7.
LINKS
CROSSREFS
Sequence in context: A008404 A170815 A170814 * A170812 A170811 A170810
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 02 2009
STATUS
approved

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Last modified February 26 11:24 EST 2024. Contains 370352 sequences. (Running on oeis4.)