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A220276
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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..1 nX3 array
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0
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2, 25, 148, 1142, 7987, 55034, 383153, 2657666, 18466741, 128094083, 888814278, 6166025688, 42777035035, 296733282297, 2058350850742, 14277750934523, 99037048938338, 686957234158089, 4764973628818287
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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....0..1..0....1..1..1....0..1..1....0..1..1....1..1..0....0..0..0
..1..0..0....0..1..1....0..0..0....0..1..1....1..1..0....1..1..0....0..0..1
..1..0..1....1..0..0....0..1..0....0..0..0....1..1..1....0..0..0....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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