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A170814 Number of permutations of 1..n with all differences of elements separated by distances 1 through 8 being respectively unique. 0
1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 12828, 17252, 19612, 21104, 18276, 15096, 11052, 8484, 6400, 5360 (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 8.

LINKS

Table of n, a(n) for n=1..22.

CROSSREFS

Sequence in context: A000940 A008404 A170815 * A170813 A170812 A170811

Adjacent sequences:  A170811 A170812 A170813 * A170815 A170816 A170817

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 02 2009

STATUS

approved

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Last modified March 8 20:14 EST 2021. Contains 341953 sequences. (Running on oeis4.)