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%I
%S 6,104,5074,723635,294738261,345350598641,1159953545419800,
%T 11179084602659460821,309007688117388883362756,
%U 24500703075201459753727015848,5572033834554753242178727061445289
%N Half the number of (n+1)X(n+1) binary arrays with no 2X2 subblock containing exactly one 1
%C Diagonal of A184197
%H R. H. Hardin, <a href="/A184188/b184188.txt">Table of n, a(n) for n = 1..14</a>
%e Some solutions for 3X3
%e ..1..0..1....1..0..1....1..0..1....0..1..0....0..1..0....1..0..0....1..0..0
%e ..1..1..1....0..1..1....1..1..1....1..1..1....1..0..1....0..1..1....0..1..1
%e ..1..1..1....1..0..0....0..0..0....0..1..1....1..1..1....0..1..0....1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 10 2011
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