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%I #5 Mar 31 2012 12:36:00
%S 16809,5002165,2002023718,873679701315,396770571117114,
%T 184478487695574108,87131390011496951676,41619801566809753837565,
%U 20050042433422012129360190,9723279387982947487498511078
%N Half the number of (n+1)X9 binary arrays with equal numbers of majority one 2X2 subblocks and majority zero 2X2 subblocks
%C Column 8 of A184467
%H R. H. Hardin, <a href="/A184466/b184466.txt">Table of n, a(n) for n = 1..18</a>
%e Some solutions for 3X9
%e ..0..0..1..1..1..1..1..0..0....0..0..1..1..0..1..1..1..0
%e ..0..0..0..1..0..0..1..1..1....0..0..0..1..0..0..1..1..0
%e ..0..0..1..1..0..0..0..0..1....0..0..0..1..1..1..0..1..0
%e ...
%e ...M..M..P..P..E..P..P..E.......M..M..P..E..M..P..P..E...
%e ...M..M..P..E..M..M..E..P.......M..M..E..P..E..E..P..E...
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 15 2011
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