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A183549 Number of nX4 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

%I A183549 #7 Jul 22 2025 09:05:19
%S A183549 9,299,5287,95101,1728533,31363527,569461759,10339213765,187720469393,
%T A183549 3408294462361,61881741606489,1123538699592837,20399220213631985,
%U A183549 370372813824090515,6724571832069212589,122092833670153549855
%N A183549 Number of nX4 0..2 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.
%C A183549 Column 4 of A183554
%H A183549 R. H. Hardin, <a href="/A183549/b183549.txt">Table of n, a(n) for n = 1..200</a>
%e A183549 Some solutions for 3X4
%e A183549 ..2..0..0..0....1..1..1..1....0..0..0..1....1..1..0..0....2..2..2..0
%e A183549 ..2..2..0..1....0..1..1..1....2..2..0..1....1..1..0..2....1..2..2..0
%e A183549 ..2..0..0..1....0..1..0..0....2..2..0..0....0..0..2..2....1..1..2..2
%K A183549 nonn
%O A183549 1,1
%A A183549 _R. H. Hardin_ Jan 05 2011