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A183310 Half the number of nX9 binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors.

%I A183310 #7 Jul 22 2025 08:48:26
%S A183310 21,56,997,18064,445859,10149621,234636215,5406312318,124597748299,
%T A183310 2872365166632,66225579904258,1527174330126193,35219108887364016,
%U A183310 812230463677554629,18731997169049673477,432004778124039265271
%N A183310 Half the number of nX9 binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors.
%C A183310 Column 9 of A183312
%H A183310 R. H. Hardin, <a href="/A183310/b183310.txt">Table of n, a(n) for n = 1..200</a>
%e A183310 Some solutions with a(1,1)=0 for 9X4
%e A183310 ..0..1..0..1....0..0..1..0....0..0..1..0....0..1..0..1....0..1..0..1
%e A183310 ..1..1..0..1....1..1..0..1....1..1..0..1....1..1..0..1....1..1..0..0
%e A183310 ..0..0..1..0....0..0..1..0....0..1..0..1....0..0..1..0....0..0..1..1
%e A183310 ..1..1..1..0....1..0..0..1....1..0..1..0....1..1..0..1....1..1..0..0
%e A183310 ..0..0..0..1....0..1..1..0....1..0..0..1....0..0..1..0....0..1..0..1
%e A183310 ..1..1..1..0....1..0..1..0....0..1..1..0....1..1..1..0....0..1..1..0
%e A183310 ..0..0..0..1....0..1..0..1....1..0..0..1....0..0..0..1....1..0..1..1
%e A183310 ..1..1..0..1....1..1..0..0....0..0..1..0....1..1..1..0....0..1..0..0
%e A183310 ..0..0..1..0....0..0..1..1....1..1..0..1....0..0..1..0....1..0..1..1
%K A183310 nonn
%O A183310 1,1
%A A183310 _R. H. Hardin_ Jan 03 2011