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A222902 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A222902 #6 Jul 23 2025 03:14:06
%S A222902 4,25,373,7794,180203,4320431,105327353,2592612272,64243363904,
%T A222902 1600125512239,40022606753953,1004596097977296,25292398905119297,
%U A222902 638445931307999125,16152880969313405490,409495374971029069517
%N A222902 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A222902 Column 4 of A222906
%H A222902 R. H. Hardin, <a href="/A222902/b222902.txt">Table of n, a(n) for n = 1..136</a>
%e A222902 Some solutions for n=3
%e A222902 ..0..0..1..1....0..1..0..1....0..0..0..0....0..0..0..0....0..0..0..0
%e A222902 ..0..0..2..2....1..1..1..1....0..0..0..0....0..0..1..0....1..0..0..0
%e A222902 ..2..2..2..2....1..1..1..1....0..1..0..0....1..1..1..1....0..0..0..0
%K A222902 nonn
%O A222902 1,1
%A A222902 _R. H. Hardin_ Mar 09 2013