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A222908 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222908 #6 Jul 23 2025 03:14:42
%S A222908 5,14,45,373,1202,18981,82020,1506810,6857704,129852811,597088326,
%T A222908 11405469595,52673539459,1011491590878,4687412959525,90358383040770,
%U A222908 419948850379586,8119819516703235,37831903319054460,733292643562816976
%N A222908 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222908 Row 3 of A222906
%H A222908 R. H. Hardin, <a href="/A222908/b222908.txt">Table of n, a(n) for n = 1..58</a>
%e A222908 Some solutions for n=3
%e A222908 ..0..0..1....0..1..0....0..0..1....0..0..0....0..0..1....0..0..0....0..0..0
%e A222908 ..0..1..1....0..0..0....0..0..0....0..0..0....0..2..2....0..0..0....1..2..2
%e A222908 ..1..1..1....0..0..0....0..0..0....0..0..1....2..2..2....0..1..1....2..2..2
%K A222908 nonn
%O A222908 1,1
%A A222908 _R. H. Hardin_ Mar 09 2013