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%I #6 Aug 12 2016 06:53:59
%S 6,10,30,42,154,478,2086,8094,33766,139874,595738,2519882,10738874,
%T 45886078,196936610,847655270,3659989354,15844521472,68767896826,
%U 299141921948,1304016379938,5695400116694,24919428238882,109210581420200
%N Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any horizontal or antidiagonal neighbor equal to 3-1.
%C Row 3 of A265856.
%H R. H. Hardin, <a href="/A265857/b265857.txt">Table of n, a(n) for n = 1..96</a>
%e Some solutions for n=4
%e ..2..2..1..2....2..1..0..0....0..1..2..2....2..2..2..1....0..0..1..0
%e ..1..2..1..0....2..1..0..1....2..2..1..0....2..1..0..0....1..2..1..0
%e ..1..0..0..0....0..1..2..2....1..0..0..1....0..1..0..1....2..2..1..2
%Y Cf. A265856.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 16 2015