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A223106
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Number of 3Xn 0..2 arrays with exactly floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
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1
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0, 16, 546, 12330, 198848, 5010580, 82588214, 2138049675, 35334863577, 934309083086, 15507491052968, 415583302042863, 6918422912560024, 187182394471313302, 3123327410493599422, 85104028524065075147
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..1..0....0..1..1....0..1..2....0..1..1....0..0..1....0..1..1....0..1..0
..2..1..2....0..1..1....2..0..0....2..1..1....2..2..1....2..1..1....0..2..2
..1..2..1....2..0..1....1..1..2....0..2..0....1..2..1....2..0..2....1..1..2
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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