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%I #3 Mar 31 2012 12:35:45
%S 1,2,2,12,20,180,648,5784,36936,485040,2034876,33492048,373375392,
%T 4974252864,52465459392,1067273994240,11538658531008,260749481442240
%N Number of permutations of 2..n+1 with no element divisible by an adjacent element.
%K nonn
%O 1,2
%A _R. H. Hardin_ Jun 17 2010
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