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A223622
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Number of nX4 0..1 arrays with row sums nondecreasing and column sums unimodal
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1
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11, 98, 751, 5303, 35413, 228401, 1437511, 8898472, 54437857, 330381980, 1993659689, 11985196268, 71858499637, 430123654878, 2571650477297, 15366254287831, 91781204372957, 548141570513665, 3273511579537537
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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
..1..1..0..1....0..0..0..1....0..0..0..0....0..0..1..0....0..1..0..0
..1..0..1..1....0..1..1..0....0..0..0..0....0..0..1..0....1..1..1..1
..1..1..1..0....1..1..1..1....1..1..0..0....1..1..0..1....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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