A177657 - OEIS

%I #5 Mar 02 2016 10:55:13

%S 1,1,70,34650,63063000,305540235000,3244612572406800,

%T 66346172137847738628

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

%Y Cf. A014608.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 10 2010