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%I #7 Apr 19 2020 23:46:51
%S 2,11,123,3288,165607,18220241,4064720816,1833956006577,
%T 1778703508587227,3374673365461249568,14101540722268888633757,
%U 114651904507399541002097761,2060026489521744559823250922304,72580676762280474254836112626897875
%N Number of n X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.
%C Diagonal of A269075.
%H R. H. Hardin, <a href="/A269069/b269069.txt">Table of n, a(n) for n = 1..23</a>
%e Some solutions for n=4
%e ..0..0..0..1. .0..0..1..0. .0..0..0..0. .0..0..1..0. .0..0..0..1
%e ..0..0..0..1. .1..0..0..1. .1..0..0..0. .1..0..0..0. .1..0..0..1
%e ..1..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..1..1. .1..0..0..0
%e ..0..1..0..0. .0..0..0..0. .0..0..0..1. .1..0..0..0. .0..0..1..0
%Y Cf. A269075.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 19 2016
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