A170811 Number of permutations of 1..n with all differences of elements separated by distances 1 through 5 being respectively unique.

1, 2, 4, 12, 40, 116, 200, 444, 760, 2160, 4368, 7852, 14040, 24284, 42312, 79340, 152764, 320920, 688780, 1577244, 3763512, 9412948

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 5.