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

%S 0,300,753975,188612400,26312329155,2954839555836

%N Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.

%K nonn

%O 1,2

%A _R. H. Hardin_ May 21 2009