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Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.
1

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

%S 0,760,911520,222334560,25996425216,1996732745784,117482611237280

%N Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.

%K nonn

%O 4,2

%A _R. H. Hardin_ May 21 2009