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A222575 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.

%I A222575 #6 Jul 23 2025 02:47:09
%S A222575 5,5,11,56,134,1500,3999,46250,126987,1462034,4136257,46688904,
%T A222575 136406909,1501835282,4510551635,48637741544,149382874117,
%U A222575 1583951305266,4954925376243,51834151640684,164570402519621,1703435934148924
%N A222575 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 A222575 Row 3 of A222573
%H A222575 R. H. Hardin, <a href="/A222575/b222575.txt">Table of n, a(n) for n = 1..25</a>
%e A222575 Some solutions for n=3
%e A222575 ..0..0..0....0..0..1....0..1..2....0..0..0....0..0..0....0..1..1....0..0..0
%e A222575 ..1..0..0....0..0..0....1..1..1....0..0..0....0..0..1....1..1..1....0..0..0
%e A222575 ..0..0..0....0..0..0....1..1..1....0..0..1....0..0..0....1..1..1....1..0..0
%K A222575 nonn
%O A222575 1,1
%A A222575 _R. H. Hardin_ Feb 25 2013