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A222826 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222826 #6 Jul 23 2025 03:06:33
%S A222826 2,80,2695,163059,4990235,324288311,10170499564,674288738013,
%T A222826 21373928441126,1435823246721009,45884479727848365,
%U A222826 3108101397467123619,99916343889082020272,6807459787910922090689,219837420324993531866814
%N A222826 Number of nX3 0..3 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222826 Column 3 of A222828
%H A222826 R. H. Hardin, <a href="/A222826/b222826.txt">Table of n, a(n) for n = 1..68</a>
%e A222826 Some solutions for n=3
%e A222826 ..0..1..2....0..1..1....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2
%e A222826 ..1..3..1....2..2..0....2..3..0....1..3..0....2..1..3....0..3..1....3..3..1
%e A222826 ..2..1..3....0..3..2....0..3..0....2..0..1....3..0..1....2..3..0....0..2..0
%K A222826 nonn
%O A222826 1,1
%A A222826 _R. H. Hardin_ Mar 06 2013