%I #9 Dec 18 2015 18:18:39
%S 1,2,34,416,24109,1482892,337258048,99770848656,92600434253746,
%T 128571982215641568,497887042842429868023,3189515020018986830642404,
%U 52334113476786453501159739264,1527284319716267796002249895255726
%N Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.
%C Diagonal of A228660
%H R. H. Hardin, <a href="/A228654/b228654.txt">Table of n, a(n) for n = 1..29</a>
%e Some solutions for n=4
%e ..1..0..0..0....1..0..0..1....1..0..0..1....1..0..0..0....1..0..1..0
%e ..0..0..0..1....1..0..0..0....0..0..0..0....1..0..0..1....0..0..0..0
%e ..0..0..0..1....0..0..0..1....0..0..0..0....1..0..0..1....1..0..1..0
%e ..1..0..0..1....0..0..0..1....0..1..0..0....1..0..0..0....0..0..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Aug 29 2013