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%I #3 Mar 31 2012 12:35:44
%S 1,70,34650,60778746,277113842057,2730472552564105,
%T 51347486465256186884
%N Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, up
%K nonn
%O 1,2
%A _R. H. Hardin_ May 10 2010