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A233368
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Number of (3+1)X(n+1) 0..1 arrays x(i,j) with row sums sum{j*x(i,j), j=1..n+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..3+1} nondecreasing
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1
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25, 139, 568, 1964, 6412, 19711, 56427, 150258, 375826, 893100, 2024828, 4391269, 9165068, 18490081, 36156100, 68675984, 126997620, 229017852, 403366974, 695484750, 1176286197, 1955039200, 3196887389, 5147543575, 8168623537
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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=5
..1..1..1..0..0..0....1..1..1..0..0..0....0..0..0..1..0..0....0..0..0..0..0..0
..1..1..0..1..1..1....0..0..0..0..0..1....1..0..0..0..1..1....0..1..1..0..0..0
..1..1..0..1..1..1....0..0..0..1..1..1....1..0..1..1..1..1....0..1..0..1..1..1
..0..0..1..1..1..1....1..1..1..1..1..1....0..1..1..1..1..1....0..0..1..1..1..1
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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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