A222017 - OEIS

%I #4 Feb 05 2013 06:11:07

%S 13,1363,86088,5925053,403317044,27460842224,1870475750419,

%T 127385479747138,8675741759311142,590866503322144180,

%U 40241368935424750183,2740665723881270704902,186654894043998446085330

%N Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns

%C Column 4 of A222020

%H R. H. Hardin, <a href="/A222017/b222017.txt">Table of n, a(n) for n = 1..131</a>

%e Some solutions for n=3

%e ..1..0..1..1....0..3..1..2....1..0..0..1....0..1..2..0....2..2..2..2

%e ..0..3..1..2....0..0..0..0....1..4..0..3....2..1..2..0....0..0..0..0

%e ..1..1..0..1....2..1..3..0....0..1..1..0....2..0..2..0....1..1..0..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 05 2013