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%I #6 Aug 12 2016 06:53:58
%S 1,7,20,104,476,2428,12362,64454,342054,1828533,9928762,54157257,
%T 298686238,1653956425,9228016750,51675269021,290902199460,
%U 1642884250719,9314059354170,52950162099266,301906974462620,1725418938358656
%N Number of 3Xn arrays containing n copies of 0..3-1 with no equal diagonal or antidiagonal neighbors and new values introduced sequentially from 0.
%C Row 3 of A265656.
%H R. H. Hardin, <a href="/A265657/b265657.txt">Table of n, a(n) for n = 1..94</a>
%e Some solutions for n=4
%e ..0..1..0..2....0..1..2..0....0..0..1..2....0..1..1..0....0..1..2..0
%e ..0..1..0..1....2..1..2..1....2..2..1..2....2..2..2..2....0..1..2..0
%e ..2..2..2..1....2..1..0..0....1..0..1..0....0..1..1..0....2..1..2..1
%Y Cf. A265656.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 12 2015
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