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A201980
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Number of n X 7 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
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0
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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=2
..3..3..3..3..3..3..3....0..0..2..2..2..2..3....1..1..1..1..1..2..3
..3..3..3..3..3..3..3....2..2..1..1..1..1..0....2..2..2..2..2..1..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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