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%I #9 Jan 11 2020 00:34:25
%S 6,126,8950,2308238,2129167114,7077040829290,84651408281226926,
%T 3644360411354234096546,564689913941224929404667818,
%U 314919227342521055797569563796454
%N Number of n X n binary matrices with every 1 adjacent to some 0 and every 0 adjacent to some 1, horizontally or vertically.
%K nonn
%O 2,1
%A _R. H. Hardin_, Jan 05 2008
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