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

%I #4 Feb 25 2013 05:57:02

%S 5,5,11,56,134,1500,3999,46250,126987,1462034,4136257,46688904,

%T 136406909,1501835282,4510551635,48637741544,149382874117,

%U 1583951305266,4954925376243,51834151640684,164570402519621,1703435934148924

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

%C Row 3 of A222573

%H R. H. Hardin, <a href="/A222575/b222575.txt">Table of n, a(n) for n = 1..25</a>

%e Some solutions for n=3

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

%e ..1..0..0....0..0..0....1..1..1....0..0..0....0..0..1....1..1..1....0..0..0

%e ..0..0..0....0..0..0....1..1..1....0..0..1....0..0..0....1..1..1....1..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 25 2013