A170812 Number of permutations of 1..n with all differences of elements separated by distances 1 through 6 being respectively unique.

1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 12828, 17252, 21136, 28716, 37276, 53624, 76740, 114856, 180232, 290280

Offset: 1

Author

R. H. Hardin Dec 02 2009

Keywords

• nonn

Comments

(Empirical) Equals A008404 for n<=2m+2, where m is the maximum difference separation 6.