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%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