%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