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A220284
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Equals one maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and vertical neighbors in a random 0..1 nX3 array
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1
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4, 31, 139, 1411, 9430, 63154, 452515, 3130768, 21630714, 150540232, 1043064746, 7226190511, 50094800811, 347052655839, 2404198149909, 16655726484462, 115373519626103, 799165840938429, 5535587924914620, 38342402997836989
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OFFSET
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1,1
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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..0..1....1..0..1....1..1..0....0..0..0....1..0..1....1..0..0....0..1..0
..0..0..1....1..0..1....1..0..1....0..0..0....0..0..0....0..0..1....0..0..0
..1..1..0....0..1..0....1..0..0....0..1..0....0..0..0....0..0..1....0..0..0
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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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