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A222490 Number of 3Xn 0..2 arrays with exactly 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

%S 0,4,6,33,75,968,2408,31222,77802,980380,2576182,31135264,86474880,

%T 997925136,2901220154,32253476486,97164153940,1049389226220,

%U 3251341368326,34336511340904,108731869474946,1128946148580572

%N Number of 3Xn 0..2 arrays with exactly 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 A222488

%H R. H. Hardin, <a href="/A222490/b222490.txt">Table of n, a(n) for n = 1..25</a>

%e Some solutions for n=4

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 22 2013

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Last modified January 19 02:30 EST 2022. Contains 350464 sequences. (Running on oeis4.)