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Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.
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%I #3 Mar 31 2012 12:35:18

%S 0,24,5292,191920,4441300,86631624,1564073084

%N Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.

%K nonn

%O 1,2

%A _R. H. Hardin_ May 21 2009