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%I #4 Jan 22 2016 12:31:37
%S 21,1323,52542,1965330,63015581,1919539785,54600088140,1497422284157,
%T 39564274878078,1019357844042958,25666134197134128,635034954062340420,
%U 15473668537066693635,372414770834024213537,8868326255432266486264
%N Number of nX4 0..2 arrays with every repeated value in every row and column one larger mod 3 than the previous repeated value, and upper left element zero.
%C Column 4 of A267952.
%H R. H. Hardin, <a href="/A267949/b267949.txt">Table of n, a(n) for n = 1..176</a>
%e Some solutions for n=3
%e ..0..0..2..1....0..2..0..0....0..2..0..0....0..1..2..2....0..0..2..1
%e ..2..2..0..2....2..2..1..2....0..2..1..0....2..1..1..2....1..0..1..0
%e ..2..0..0..1....2..0..1..2....1..0..2..2....1..0..2..1....1..2..0..2
%Y Cf. A267952.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 22 2016