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A223817
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Number of 3Xn 0..2 arrays with row sums nondecreasing and column sums unimodal
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1
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10, 222, 4120, 65465, 921010, 11789302, 139965348, 1562685952, 16583874090, 168662333466, 1654400665258, 15732261029037, 145639935220714, 1317015705919726, 11667008847929888, 101490035584201884
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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
..2..1..0....1..1..0....0..2..1....1..2..0....0..1..1....0..0..0....0..2..1
..2..0..2....2..1..2....0..1..2....1..2..0....1..2..0....2..1..0....0..2..1
..1..2..1....2..2..2....2..0..2....1..1..2....1..2..1....2..1..2....0..2..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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