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A183552 Number of nX7 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

%I A183552 #7 Jul 22 2025 09:05:42
%S A183552 63,25785,3721925,569461759,87176303417,13344696858771,
%T A183552 2043774880960645,313000943874975793,47935484320796681363,
%U A183552 7341240634658342843595,1124298676282804824274345,172184481387904369618417369
%N A183552 Number of nX7 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.
%C A183552 Column 7 of A183554
%H A183552 R. H. Hardin, <a href="/A183552/b183552.txt">Table of n, a(n) for n = 1..18</a>
%e A183552 Some solutions for 3X7
%e A183552 ..0..0..1..1..1..1..2....0..0..2..2..2..2..1....0..0..1..0..0..0..2
%e A183552 ..0..0..1..0..2..2..2....0..0..0..2..2..1..1....0..0..1..1..1..0..2
%e A183552 ..0..0..1..0..2..2..2....0..0..2..2..2..2..2....0..0..0..0..1..0..0
%K A183552 nonn
%O A183552 1,1
%A A183552 _R. H. Hardin_ Jan 05 2011