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%I #4 Feb 17 2013 17:07:47
%S 4,18,118,1391,20340,342953,6221698,113556454,2103238076,38940850866,
%T 724814585064,13496985711211,251700828899740,4703187944642436,
%U 87873606070564444,1646203673458642042,30815057060615530576
%N Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order
%C Column 4 of A222378
%H R. H. Hardin, <a href="/A222375/b222375.txt">Table of n, a(n) for n = 1..50</a>
%e Some solutions for n=4
%e ..0..0..0..0....0..0..1..0....0..0..0..0....0..0..0..0....0..0..1..1
%e ..0..0..0..0....0..0..2..1....0..0..0..0....0..0..0..0....0..1..1..1
%e ..0..0..0..0....0..0..0..0....0..1..0..2....1..2..0..0....2..1..1..1
%e ..1..1..2..2....0..0..0..0....0..0..0..0....2..3..0..0....2..2..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 17 2013
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