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Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically
1

%I #7 Dec 18 2015 18:18:02

%S 2,16,98,1309,21145,612439,28188778,2088382007,241159388724,

%T 45610488555258,13703703085638203,6587710602249205713,

%U 5068113112003743826155,6252316203337352775508286

%N Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically

%C Diagonal of A207918

%H R. H. Hardin, <a href="/A207913/b207913.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 21 2012