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A183580 Half the number of nX5 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

%I A183580 #7 Jul 22 2025 09:06:26
%S A183580 14,2216,110674,5987795,320224986,17195908538,922710498351,
%T A183580 49526167251643,2658141294593252,142669482408162261,
%U A183580 7657427974138825496,410994055177191194749,22059119691987705997667,1183970555622672309839445
%N A183580 Half the number of nX5 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.
%C A183580 Column 5 of A183584
%H A183580 R. H. Hardin, <a href="/A183580/b183580.txt">Table of n, a(n) for n = 1..135</a>
%e A183580 Some solutions with a(1,1)<=1 for 3X5
%e A183580 ..0..1..1..0..1....0..0..1..1..1....0..0..0..0..2....0..0..1..1..3
%e A183580 ..0..0..0..0..1....0..1..0..0..1....0..0..0..3..2....2..0..1..1..3
%e A183580 ..0..0..0..0..1....0..1..0..1..1....1..1..0..3..3....2..0..0..3..3
%K A183580 nonn
%O A183580 1,1
%A A183580 _R. H. Hardin_ Jan 05 2011