%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