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%I #6 Aug 12 2016 06:53:59
%S 2,8,30,146,620,3018,14356,72070,366704,1914616,10149476,54660630,
%T 297665832,1637684396,9080967528,50697416118,284611241532,
%U 1605400483260,9092172075452,51674059356836,294578579777600,1683830972093940
%N Number of 3Xn arrays containing n copies of 0..3-1 with no element plus any vertical or antidiagonal neighbor equal to 3-1.
%C Row 3 of A266042.
%H R. H. Hardin, <a href="/A266043/b266043.txt">Table of n, a(n) for n = 1..105</a>
%e Some solutions for n=4
%e ..2..0..0..2....0..1..2..0....2..2..1..0....2..0..2..0....2..1..1..1
%e ..1..1..1..1....0..2..1..1....2..2..0..0....1..1..1..1....2..2..0..0
%e ..2..0..0..2....1..2..2..0....1..1..0..1....0..0..2..2....2..1..0..0
%Y Cf. A266042.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 20 2015
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