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Number of 3Xn arrays containing n copies of 0..3-1 avoiding the pattern equal-up in every row and column.
1

%I #6 Aug 12 2016 06:54:17

%S 6,74,852,10210,124466,1539739,19271229,243392830,3095718114,

%T 39591108117,508549674595,6555349397662,84743875128342,

%U 1098136390356477,14258478535216226,185450173389172712,2415532450075364094

%N Number of 3Xn arrays containing n copies of 0..3-1 avoiding the pattern equal-up in every row and column.

%C Row 3 of A269336.

%H R. H. Hardin, <a href="/A269337/b269337.txt">Table of n, a(n) for n = 1..49</a>

%e Some solutions for n=4

%e ..0..1..2..2. .1..2..1..2. .2..2..2..1. .1..0..2..0. .1..1..0..1

%e ..2..1..2..0. .0..2..1..1. .1..2..1..1. .0..2..1..2. .0..2..2..2

%e ..1..1..0..0. .2..0..0..0. .0..0..0..0. .1..2..0..1. .0..1..2..0

%Y Cf. A269336.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 24 2016