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%I #3 Mar 31 2012 12:35:18
%S 0,5,105372,92123514,25367820672,3777055329267
%N Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order.
%K nonn
%O 4,2
%A _R. H. Hardin_ May 21 2009