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A201699
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Number of nX7 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, 60, 3838, 607919, 142436489, 27102769900, 3262897246338, 253484699853930, 13657827589827288, 542530203631847499, 16634470482072064655, 407700696414920035296, 8211702473582080609860, 139013768818199221546289
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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..1..1..1..1..2..2....0..0..0..0..0..2..2....0..1..1..1..1..1..1
..2..0..0..1..2..0..0....0..2..2..2..2..0..0....1..0..0..0..1..1..1
..2..2..2..1..0..0..0....2..1..1..1..1..0..0....2..1..1..1..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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