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A184754 Half the number of n X n binary arrays with no 1 having an adjacent 1 both above and to its left.

%I A184754 #9 Jul 22 2025 09:42:24
%S A184754 1,7,163,12397,3110914,2568513843,6982256142285,62483420093901107,
%T A184754 1840782554883258104105,178527915853668578288219231,
%U A184754 57000185549334885919706636039360,59911857895558455825087768017439269698
%N A184754 Half the number of n X n binary arrays with no 1 having an adjacent 1 both above and to its left.
%C A184754 Diagonal of A184761
%H A184754 R. H. Hardin, <a href="/A184754/b184754.txt">Table of n, a(n) for n = 1..19</a>
%e A184754 Some solutions for 3X3
%e A184754 ..1..1..0....1..1..1....1..1..0....1..0..1....1..0..1....0..0..1....0..1..1
%e A184754 ..0..1..0....1..0..1....0..1..1....1..1..0....1..0..1....0..0..0....1..0..1
%e A184754 ..0..1..0....1..1..0....1..0..0....0..0..0....1..0..0....1..1..0....0..0..0
%K A184754 nonn
%O A184754 1,2
%A A184754 _R. H. Hardin_ Jan 21 2011