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A207913 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically.

%I A207913 #9 Jul 22 2025 20:59:11
%S A207913 2,16,98,1309,21145,612439,28188778,2088382007,241159388724,
%T A207913 45610488555258,13703703085638203,6587710602249205713,
%U A207913 5068113112003743826155,6252316203337352775508286
%N A207913 Number of n X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically.
%C A207913 Diagonal of A207918
%H A207913 R. H. Hardin, <a href="/A207913/b207913.txt">Table of n, a(n) for n = 1..16</a>
%e A207913 Some solutions for n=4
%e A207913 ..1..1..0..0....0..0..1..0....0..0..1..1....1..1..1..1....0..0..1..0
%e A207913 ..0..0..1..0....0..0..1..0....1..0..0..1....1..1..0..0....1..1..0..0
%e A207913 ..0..0..1..1....1..1..0..0....1..0..0..1....0..1..0..0....1..1..0..0
%e A207913 ..1..0..0..1....1..1..0..0....0..1..0..0....0..0..1..1....0..1..0..0
%K A207913 nonn
%O A207913 1,1
%A A207913 _R. H. Hardin_ Feb 21 2012