A178848 Number of permutations of 5..n+4 with no element divisible by an adjacent element.

1, 2, 6, 24, 120, 480, 3600, 23040, 221760, 1895040, 17942400, 195229440, 2726760960, 29650279680, 479288355840, 6120338273280, 99262251970560, 1726003206789120

Offset

1,2

Links

Table of n, a(n) for n=1..18.

Crossrefs

Sequence in context: A189859 A189569 A174701 * A173845 A258216 A263748

Adjacent sequences: A178845 A178846 A178847 * A178849 A178850 A178851

Keyword

nonn

Author

R. H. Hardin Jun 17 2010

Status

approved