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A183321 Number of nX9 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.

%I A183321 #7 Jul 22 2025 08:49:16
%S A183321 89,1097,28959,498825,10288475,190243099,3674032121,68795107993,
%T A183321 1301324910599,24374459510955,457521652409443,8556633331945529,
%U A183321 160077250226203655,2989991870865523923,55846494235069318769
%N A183321 Number of nX9 binary arrays with an element zero only if there are an even number of ones to its left and an even number of ones above it.
%C A183321 Column 9 of A183322
%H A183321 R. H. Hardin, <a href="/A183321/b183321.txt">Table of n, a(n) for n = 1..200</a>
%e A183321 Some solutions for 5X9
%e A183321 ..0..1..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
%e A183321 ..0..1..1..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
%e A183321 ..0..0..0..0..0..0..1..1..0....1..1..1..1..0..0..1..1..1
%e A183321 ..0..0..0..0..1..1..1..1..1....1..1..1..1..0..0..1..1..1
%e A183321 ..0..1..1..0..1..1..1..1..1....0..0..0..1..1..0..0..0..0
%K A183321 nonn
%O A183321 1,1
%A A183321 _R. H. Hardin_ Jan 03 2011