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%I #5 Jan 01 2024 02:06:33
%S 0,264,19386752,51689441800,44408699858208,22152650667809256
%N Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.
%K nonn
%O 2,2
%A _R. H. Hardin_, May 21 2009