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A201538
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Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor
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1
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18, 899, 72811, 9526987, 1408677515, 208164634003, 28456420346436, 3505159734744220, 387870239576486118, 38812326822498760643, 3543738686502556683539, 297838575975499416278867
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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..0..0..0....0..0..0..0..1..1..1....0..0..1..1..1..2..2
..0..1..1..1..1..1..2....0..0..0..1..1..2..2....1..1..2..2..2..1..2
..1..1..1..2..2..2..2....2..2..2..0..0..1..1....2..2..0..0..0..1..2
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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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