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Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.
0

%I #3 Mar 31 2012 12:35:18

%S 0,3,81808,56283220,12683975484,1689235173192,168235956902400

%N Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.

%K nonn

%O 2,2

%A _R. H. Hardin_ May 21 2009