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Half the number of (n+2)X(n+2) binary arrays with each 3X3 subblock having sum 4 or 5
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%I #5 Mar 31 2012 12:36:06

%S 126,3988,222632,24581099,5634207241,2438542117645,2065963672906699

%N Half the number of (n+2)X(n+2) binary arrays with each 3X3 subblock having sum 4 or 5

%C Diagonal of A186825

%e Some solutions for 4X4 with a(1,1)=0

%e ..0..1..0..1....0..1..1..0....0..0..0..0....0..1..0..1....0..0..0..0

%e ..1..0..1..1....0..0..1..0....0..1..1..1....1..0..1..1....1..1..0..0

%e ..1..1..0..0....1..1..0..0....0..1..1..0....1..0..0..0....0..1..1..1

%e ..0..0..1..0....1..0..1..1....0..0..0..0....1..1..0..1....0..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 27 2011