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A201979
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Number of nX6 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards
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1
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4, 304, 117744, 91893727, 48452117136, 13486744809160, 2238761872232964, 248685266018356303, 19939344176339744246, 1214420344528171330419, 58291620982242700295226, 2267753515670520458933950
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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....0..1..2..2..2..2....0..0..1..1..1..1....1..1..3..3..3..3
..3..3..3..3..3..3....3..2..0..0..0..0....3..3..0..0..0..0....3..3..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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