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%I #3 Mar 31 2012 12:35:44
%S 1,20,1680,367082,164721913,131886772257,171507866127356,
%T 338575969590494675
%N Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, down, up, up
%K nonn
%O 1,2
%A _R. H. Hardin_ May 10 2010