A178847 - OEIS

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A178847

Number of permutations of 4..n+3 with no element divisible by an adjacent element.

%I #3 Mar 31 2012 12:35:45

%S 1,2,6,24,72,480,2640,23040,128640,1444320,14549760,159007680,

%T 1556058240,24239980800,301025439360,5305897094400,63948561909120,

%U 1139924740993920

%N Number of permutations of 4..n+3 with no element divisible by an adjacent element.

%K nonn

%O 1,2

%A _R. H. Hardin_ Jun 17 2010