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%I #5 Nov 03 2013 07:44:55
%S 1,3,11,89,685,13785,223270,10204445,367167586,37025661591,
%T 2960154980175,660415936461789,116764729695106769,
%U 57661136320504955250,22542682942448533813110,24616708332260554368059831
%N Number of black square subarrays of (n+1)X(n+1) binary arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors, with upper left element zero
%C Diagonal of A231070
%H R. H. Hardin, <a href="/A231066/b231066.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for n=4
%e ..x..0..x..0..x....x..0..x..0..x....x..0..x..0..x....x..0..x..0..x
%e ..1..x..1..x..0....1..x..1..x..1....1..x..1..x..0....1..x..1..x..0
%e ..x..0..x..1..x....x..0..x..0..x....x..0..x..1..x....x..0..x..1..x
%e ..0..x..0..x..1....0..x..1..x..1....1..x..0..x..0....1..x..1..x..0
%e ..x..1..x..0..x....x..1..x..0..x....x..0..x..1..x....x..0..x..1..x
%K nonn
%O 1,2
%A _R. H. Hardin_, Nov 03 2013