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%I #6 Mar 31 2012 12:35:54
%S 11,129,3357,197133,25468475,7377050305,4699303424280,
%T 6677571801577027,20920936413508511832,145733864202975702001549,
%U 2243086329393853088964598846,76619744675820265499643398728545
%N Number of (n+1)X(n+1) binary arrays with each element of every 2X2 subblock being the sum mod 2 of two others
%C Diagonal of A183845
%H R. H. Hardin, <a href="/A183837/b183837.txt">Table of n, a(n) for n = 1..13</a>
%e Some solutions for 3X3
%e ..1..1..1....1..1..1....1..1..0....1..0..0....1..0..1....1..1..0....1..0..0
%e ..1..0..1....0..0..1....0..1..0....0..1..1....1..1..1....0..0..1....1..1..1
%e ..1..1..1....1..1..1....0..1..0....1..0..1....0..0..1....1..1..0....0..1..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 07 2011