%I #3 Mar 31 2012 12:35:44
%S 1,65,27707,41243158,159108376040,1325880163281871,
%T 21089698925887652590
%N Number of permutations of 4 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