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%I #4 Jan 26 2013 08:46:22
%S 13,2113,190756,18636989,1804472268,174820457922,16936005698353,
%T 1640717334488903,158947987755078035,15398437448141904936,
%U 1491757378064714004413,144517269678468770214198
%N Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without consecutive moves in the same direction
%C Column 4 of A221824
%H R. H. Hardin, <a href="/A221823/b221823.txt">Table of n, a(n) for n = 1..25</a>
%e Some solutions for n=3
%e ..0..1..0..2....1..0..1..1....0..1..0..1....0..3..0..0....0..0..2..0
%e ..1..4..0..0....2..3..2..0....1..2..0..4....1..1..1..2....2..0..4..0
%e ..0..0..1..3....0..1..1..0....1..2..0..0....0..1..1..2....1..2..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 26 2013
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