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A223039 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

%I A223039 #6 Jul 23 2025 03:24:47
%S A223039 11,1265,229437,42964721,8206670940,1590576924149,311543161837482,
%T A223039 61504928367575855,12217149892788877445,2438751075983097268086,
%U A223039 488783777099597628446445,98294363180577784998680559
%N A223039 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
%C A223039 Column 4 of A223041
%H A223039 R. H. Hardin, <a href="/A223039/b223039.txt">Table of n, a(n) for n = 1..23</a>
%e A223039 Some solutions for n=3
%e A223039 ..0..1..0..2....0..1..0..1....0..0..1..0....0..1..0..0....0..1..0..2
%e A223039 ..3..0..3..0....1..1..2..2....2..0..3..0....2..1..2..2....3..1..0..3
%e A223039 ..3..0..1..1....2..0..3..0....3..2..1..2....3..1..0..3....0..0..1..1
%K A223039 nonn
%O A223039 1,1
%A A223039 _R. H. Hardin_ Mar 12 2013