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A203845
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Number of nX7 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
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1
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1, 3502, 4683983, 2828543595, 1851737877261, 1343321735549790, 962798716189325069, 683655464831096685412, 487678114181526321589432, 348497070880545014679320935, 248863069745305150479109312811
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..1..2..2..1..2..2..0....1..1..2..2..0..1..1....3..3..0..2..3..3..3
..3..3..2..0..2..2..1....1..1..2..2..0..1..1....3..3..0..3..3..2..3
..3..3..2..3..3..3..1....2..2..3..3..1..2..2....1..1..2..3..2..0..3
..3..3..1..3..3..3..0....2..2..3..3..0..2..2....1..1..2..3..3..3..3
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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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