A178848 - OEIS

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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

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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