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A178846
Number of permutations of 3..n+2 with no element divisible by an adjacent element.
0
1, 2, 6, 12, 72, 336, 1824, 13152, 134880, 649296, 8572800, 102194400, 1033046880, 12143232960, 210042192960, 2372176649280, 46447968686400, 648516678024960
OFFSET
1,2
CROSSREFS
Sequence in context: A287142 A076220 A258213 * A173843 A107763 A166470
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 17 2010
STATUS
approved