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A207699 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.

%I A207699 #9 Jul 22 2025 20:41:42
%S A207699 2,16,102,729,8151,105625,1369900,19891600,334808748,6181890625,
%T A207699 122401625127,2624869821025,60940432893132,1515981414587236,
%U A207699 40169735443014974,1131549414709903225,33790458968920700067
%N A207699 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 0 vertically.
%C A207699 Diagonal of A207703
%H A207699 R. H. Hardin, <a href="/A207699/b207699.txt">Table of n, a(n) for n = 1..18</a>
%e A207699 Some solutions for n=4
%e A207699 ..0..1..1..1....1..0..0..1....1..1..1..1....0..0..1..1....1..0..1..1
%e A207699 ..0..0..1..1....1..0..0..1....1..1..0..0....1..0..1..1....1..1..0..0
%e A207699 ..0..1..1..1....1..0..0..1....1..1..1..1....0..0..1..1....1..1..1..0
%e A207699 ..0..1..1..1....1..0..0..1....1..1..0..0....0..0..1..1....1..1..1..0
%K A207699 nonn
%O A207699 1,1
%A A207699 _R. H. Hardin_ Feb 19 2012