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%I #9 Dec 18 2015 18:18:38
%S 1,2,21,382,17578,1755243,402968942,207573951234,242284444195349,
%T 638096588519781536,3798652903378388363280,51076133156779686951912785,
%U 1551660182965034835583479000348,106488245934766828340647881986248382
%N Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.
%C Diagonal of A228390
%H R. H. Hardin, <a href="/A228384/b228384.txt">Table of n, a(n) for n = 1..30</a>
%e Some solutions for n=4
%e ..1..0..0..0....1..0..0..1....1..0..1..0....1..0..0..1....1..0..0..0
%e ..0..0..0..1....0..0..1..0....0..1..0..0....0..0..0..0....0..0..1..0
%e ..0..0..1..0....0..0..0..0....0..0..0..1....1..0..1..0....1..0..0..1
%e ..0..0..0..1....0..1..0..0....0..1..0..0....0..1..0..1....0..0..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Aug 21 2013
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