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

%I #7 Dec 18 2015 18:18:00

%S 2,16,84,828,9668,128292,2367656,53882188,1466226618,53206438448,

%T 2394759800657,133358534841765,9689628432751700,882639945891070144,

%U 101352502023903785258,15016562984066207345796,2813722789748877650099592

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

%C Diagonal of A207346

%H R. H. Hardin, <a href="/A207340/b207340.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 17 2012