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

%I #4 Mar 11 2013 06:25:35

%S 5,14,43,314,946,10417,36987,431995,1588033,18801286,69943017,

%T 834028084,3124625123,37457769214,141096804709,1698224538010,

%U 6424372900737,77564926861208,294441267192765,3563869328626666,13566837259043749

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

%C Row 3 of A222986

%H R. H. Hardin, <a href="/A222988/b222988.txt">Table of n, a(n) for n = 1..60</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 11 2013