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A170812
Number of permutations of 1..n with all differences of elements separated by distances 1 through 6 being respectively unique.
0
1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 12828, 17252, 21136, 28716, 37276, 53624, 76740, 114856, 180232, 290280
OFFSET
1,2
COMMENTS
(Empirical) Equals A008404 for n<=2m+2, where m is the maximum difference separation 6.
CROSSREFS
Sequence in context: A170815 A170814 A170813 * A170811 A170810 A170809
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 02 2009
STATUS
approved