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A222584 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.

%I A222584 #6 Jul 23 2025 02:47:50
%S A222584 4,18,112,1087,11442,128213,1471412,17068476,198654710,2328829654,
%T A222584 27335961632,322535055233,3807753230632,45124599083917,
%U A222584 535113331694641,6363369440619695,75729209656948170,903078623804307816
%N A222584 Number of nX4 0..2 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.
%C A222584 Column 4 of A222587
%H A222584 R. H. Hardin, <a href="/A222584/b222584.txt">Table of n, a(n) for n = 1..83</a>
%e A222584 Some solutions for n=3
%e A222584 ..0..1..1..1....0..0..0..0....0..1..1..1....0..0..0..0....0..0..0..1
%e A222584 ..2..1..1..1....1..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0
%e A222584 ..0..1..1..1....0..2..0..0....0..1..1..1....0..0..0..1....0..0..0..0
%K A222584 nonn
%O A222584 1,1
%A A222584 _R. H. Hardin_ Feb 25 2013