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A220530
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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, vertical and antidiagonal neighbors in a random 0..3 nX3 array
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0
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2, 27, 274, 2660, 23948, 204634, 1697940, 13869434, 112203992, 902932630, 7245817986, 58059100355
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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..1..0....1..0..0....0..1..1....0..0..0....0..0..0....0..1..0....0..1..1
..1..1..0....1..0..0....0..0..0....1..0..1....1..1..0....0..1..1....1..1..0
..1..0..0....1..0..1....1..1..0....1..1..1....0..1..0....0..1..0....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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