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A232888
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Number of (2+1)X(n+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..n+1} nondecreasing, and column sums sum{i*x(i,j), i=1..2+1} nondecreasing
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1
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578, 12920, 235936, 3695555, 51264185, 644182816, 7460893864, 80676054597, 822720588842, 7976326518730, 73999362424318, 660467507825188, 5696611476327209, 47660470235252790, 388033944154755006
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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
..1..2..2....0..0..0....2..2..2....2..2..1....0..1..1....0..3..1....2..0..3
..3..1..1....1..1..1....2..2..2....1..3..2....2..0..2....3..0..3....0..3..2
..1..2..3....2..3..3....1..2..3....3..2..3....2..3..3....2..3..3....0..3..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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