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A207340 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.

%I A207340 #9 Jul 22 2025 20:18:11
%S A207340 2,16,84,828,9668,128292,2367656,53882188,1466226618,53206438448,
%T A207340 2394759800657,133358534841765,9689628432751700,882639945891070144,
%U A207340 101352502023903785258,15016562984066207345796,2813722789748877650099592
%N A207340 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 A207340 Diagonal of A207346
%H A207340 R. H. Hardin, <a href="/A207340/b207340.txt">Table of n, a(n) for n = 1..19</a>
%e A207340 Some solutions for n=4
%e A207340 ..1..0..0..1....1..1..1..1....1..1..0..1....1..0..0..1....0..1..0..0
%e A207340 ..1..1..0..0....1..1..0..0....1..1..0..1....0..1..0..0....0..0..1..0
%e A207340 ..0..0..1..0....0..0..1..0....0..0..1..0....1..0..1..0....1..0..0..1
%e A207340 ..0..1..0..1....1..1..0..1....0..0..1..0....1..1..1..1....0..1..0..0
%K A207340 nonn
%O A207340 1,1
%A A207340 _R. H. Hardin_ Feb 17 2012