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Number of nX4 0..3 arrays with no more than floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order
1

%I #4 Mar 06 2013 08:30:38

%S 11,1154,163059,23664739,3489313607,520160675223,78214529020708,

%T 11843031775865125,1803481044258862295,275936349234703904616,

%U 42386246052840276405669,6532812606151325343712993

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

%C Column 4 of A222828

%H R. H. Hardin, <a href="/A222827/b222827.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for n=3

%e ..0..1..1..2....0..1..2..3....0..1..1..2....0..1..2..3....0..1..2..3

%e ..1..3..0..3....2..0..2..2....1..0..1..1....1..3..2..0....2..0..1..3

%e ..3..3..2..1....1..3..3..0....2..3..2..0....2..3..1..2....2..2..3..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 06 2013