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A233030
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Number of (n+1)X(3+1) 0..3 arrays with row and column sums nondecreasing, and no adjacent elements equal
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0
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333, 3132, 55642, 566933, 7169782, 74939353, 839537894, 8735284526, 93454206487, 969444236906, 10189585915899
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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..0..2..1....1..0..3..2....0..1..2..1....0..1..0..2....0..1..0..1
..1..2..1..2....0..3..0..3....2..3..0..3....1..3..2..0....2..0..3..0
..0..3..2..3....2..0..3..2....3..0..3..2....0..2..3..2....3..2..1..2
..1..2..3..2....1..2..1..3....0..3..2..3....3..1..2..3....0..3..2..3
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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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