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A221289
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Equals two maps: number of nX6 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 nX6 array
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0
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12, 792, 48298, 2890017, 172905144, 10344276279, 618825190371, 37018574118868, 2214457259485909, 132469006243923162, 7924304243009714341, 474032340904538992523, 28356641623302251544461
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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....0..0..0..0..1..1....0..0..0..1..0..0....0..0..1..0..0..1
..1..1..0..0..1..0....1..0..0..0..0..0....0..0..1..1..0..1....1..0..1..0..1..0
..0..0..1..1..0..0....1..1..1..0..1..0....1..0..1..0..1..0....1..0..1..1..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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