A177670 - OEIS

%I #5 Mar 02 2016 10:56:33

%S 1,1,70,34650,63063000,304532310180,3216303433012890,

%T 65316931455144717352

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

%Y Cf. A014608.

%K nonn

%O 0,3

%A _R. H. Hardin_, May 10 2010