%I #9 Dec 18 2015 18:18:38
%S 1,2,14,172,4354,211588,20185842,3737615288,1349721589622,
%T 948593164919044,1298594593323021084,3461591189556243601228,
%U 17969903126848842785918376,181660279488635404176787338286
%N Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, vertically or antidiagonally.
%C Diagonal of A228482
%H R. H. Hardin, <a href="/A228476/b228476.txt">Table of n, a(n) for n = 1..27</a>
%e Some solutions for n=4
%e ..1..0..0..1....1..0..0..1....1..0..0..0....1..0..1..0....1..0..0..0
%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1
%e ..0..0..0..1....1..0..0..0....0..0..0..0....1..0..0..1....0..0..0..0
%e ..1..0..0..0....0..0..0..1....0..0..0..1....0..1..0..0....0..1..0..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Aug 22 2013