A177659 - OEIS

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

%S 1,70,34650,61936740,290927564416,2971394893453510,

%T 58139421887847131772

%N Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, up, down

%K nonn

%O 1,2

%A _R. H. Hardin_ May 10 2010