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%I #3 Mar 31 2012 12:35:44
%S 1,20,1680,369240,167472864,135960447600,179637314905576,
%T 360796550854271920
%N Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, up, down, down, down
%K nonn
%O 1,2
%A _R. H. Hardin_ May 10 2010