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%I #4 Jan 15 2013 21:09:44
%S 1,217,4390,194879,6688747,250167826,9077677881,333226472511,
%T 12173165267828,445650138090486,16298689612917528,596369615071847374,
%U 21816211474871696352,798162015570301300322,29199761336459862799952
%N Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without consecutive moves in the same direction
%C Column 4 of A221429
%H R. H. Hardin, <a href="/A221427/b221427.txt">Table of n, a(n) for n = 1..30</a>
%e Some solutions for n=3
%e ..1..1..1..0....1..1..1..1....0..1..0..0....1..1..1..0....1..1..0..1
%e ..2..0..3..2....1..1..1..1....2..1..3..2....1..2..2..2....0..0..3..2
%e ..1..0..1..0....1..2..1..0....2..0..1..0....0..2..0..0....2..1..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 15 2013
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