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

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

%S 6,74,574,4564,41526,419516,4351224,45696410,485785550,5235947490,

%T 57045797346,626684612988,6931703318082,77128097640376,

%U 862658820597866,9692104806070332,109322097799502508,1237402642148758338

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

%C Row 3 of A269646.

%H R. H. Hardin, <a href="/A269647/b269647.txt">Table of n, a(n) for n = 1..44</a>

%e Some solutions for n=4

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

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

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

%Y Cf. A269646.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 02 2016