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A201698
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Number of nX6 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards
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1
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3, 48, 2068, 167625, 14268351, 795339012, 27102769900, 615440785548, 10106227864338, 127441635892627, 1290114077123683, 10846768837607450, 77797729805055016, 486398599750167133, 2697872438447793007
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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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FORMULA
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Empirical: a(n) is a polynomial of degree 34
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EXAMPLE
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Some solutions for n=3
..0..1..1..2..2..2....1..1..2..2..2..2....0..1..1..1..1..2....0..1..1..1..2..2
..2..0..1..0..2..2....2..2..1..1..2..2....1..1..1..1..2..0....2..0..2..2..0..0
..2..2..1..1..0..0....2..2..2..2..1..1....2..1..1..1..0..0....2..2..0..0..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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