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A220403
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Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX3 array
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1
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2, 17, 122, 720, 4304, 25391, 150079, 884793, 5205467, 30603312, 179828144, 1056663902, 6208358851, 36476199327, 214305557200, 1259086948475, 7397361356851, 43460791661461, 255339657788151, 1500164308002762
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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..0....1..0..0....1..1..1....0..0..1....0..1..0....0..1..1....0..0..0
..0..0..1....0..1..0....0..0..0....0..0..0....0..0..0....0..0..0....1..1..0
..0..0..0....0..0..0....1..0..0....0..1..0....1..1..1....0..1..1....0..1..1
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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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