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%I #6 Mar 31 2012 12:35:53
%S 6,32,256,3472,73344,2542368,140090240,12503757968,1787244586880,
%T 411927241028352,152442345546739968,90819596095626887104,
%U 86960426240537811217920,133963874202574308172821152
%N Number of (n+1)X(n+1) binary arrays with every 2X2 subblock nonsingular
%C Diagonal of A183688
%H R. H. Hardin, <a href="/A183681/b183681.txt">Table of n, a(n) for n = 1..19</a>
%e Some solutions for 3X3
%e ..0..1..0....0..1..1....1..0..1....1..1..0....1..1..1....1..1..1....0..1..0
%e ..1..1..1....1..0..1....0..1..0....1..0..1....1..0..1....1..0..1....1..0..1
%e ..0..1..0....1..1..1....1..0..1....1..1..0....1..1..1....1..1..0....1..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2011
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