A177611 - OEIS

%I #3 Mar 31 2012 12:35:44

%S 1,19,1446,274821,105551154,71820303857,79064800732654,

%T 131813777765106241

%N Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, down, up

%K nonn

%O 1,2

%A _R. H. Hardin_ May 10 2010