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A220373
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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 and vertical neighbors in a random 0..2 nX3 array
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1
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2, 23, 236, 2095, 18296, 154562, 1280878, 10492879, 85253117, 688997802, 5548695509, 44580367227, 357622113010, 2865892548630, 22950987106487, 183716756194773, 1470171909243331, 11762592622678971, 94098427741015878
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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
..1..1..0....1..1..0....1..0..1....1..1..0....0..1..1....1..0..0....0..1..1
..1..1..1....1..1..0....0..0..1....1..0..0....0..0..1....0..1..1....1..0..1
..0..0..1....0..0..0....1..1..0....0..0..0....1..0..0....0..0..1....1..1..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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