%I #3 Mar 31 2012 12:35:18
%S 0,2,268128,256405004,82725015630,17440046568756
%N Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
%K nonn
%O 1,2
%A _R. H. Hardin_ May 21 2009