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A170811
Number of permutations of 1..n with all differences of elements separated by distances 1 through 5 being respectively unique.
0
1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 14040, 24284, 42312, 79340, 152764, 320920, 688780, 1577244, 3763512, 9412948
OFFSET
1,2
COMMENTS
(Empirical) Equals A008404 for n<=2m+2, where m is the maximum difference separation 5.
CROSSREFS
Sequence in context: A170814 A170813 A170812 * A170810 A170809 A170808
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 02 2009
STATUS
approved