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A220796
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Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 3Xn array
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0
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1, 23, 142, 1753, 15486, 132977, 1115041, 9161834, 74617693, 602687874, 4850347565, 38924669434
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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....1..1..0....0..0..1....0..0..0....1..1..1....0..0..0....0..1..0
..1..1..0....0..0..1....0..0..0....0..0..1....0..0..0....0..1..0....0..0..0
..0..1..1....0..0..0....1..0..0....1..0..1....0..0..1....0..0..1....1..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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