cp's OEIS Frontend

A183579 Half the number of nX4 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.

%I A183579 #7 Jul 22 2025 09:06:18
%S A183579 8,407,9667,240358,5987795,149355515,3724940988,92915045150,
%T A183579 2317648165893,57811518197886,1442053664104187,35970710709296927,
%U A183579 897256757776720016,22381259751777880373,558280348730102033060
%N A183579 Half the number of nX4 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors.
%C A183579 Column 4 of A183584
%H A183579 R. H. Hardin, <a href="/A183579/b183579.txt">Table of n, a(n) for n = 1..200</a>
%e A183579 Some solutions with a(1,1)<=1 for 3X4
%e A183579 ..0..0..2..1....1..1..1..1....1..1..1..1....1..3..1..1....0..0..1..1
%e A183579 ..1..0..2..1....1..3..1..1....0..0..2..2....1..3..3..1....1..1..1..1
%e A183579 ..1..0..2..2....1..3..3..1....0..0..0..2....2..2..3..3....1..0..0..1
%K A183579 nonn
%O A183579 1,1
%A A183579 _R. H. Hardin_ Jan 05 2011