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A220239
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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..1 nX3 array
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1
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2, 23, 148, 1131, 8127, 58091, 419164, 3016838, 21697096, 156223103, 1124229264, 8090787596, 58233550828, 419095508303, 3016219087452, 21707952324961, 156230959713801, 1124391382315226, 8092241949528463, 58239664959701115
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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..0..0....0..1..0....0..0..0....1..1..0....0..1..0....0..1..0....0..0..1
..1..0..0....1..1..0....0..0..1....0..1..1....0..0..1....1..1..0....0..0..0
..0..1..0....0..0..0....0..1..1....0..0..1....0..0..1....0..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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