A170814 Number of permutations of 1..n with all differences of elements separated by distances 1 through 8 being respectively unique.

1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 12828, 17252, 19612, 21104, 18276, 15096, 11052, 8484, 6400, 5360

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