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A223627
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Number of 3Xn 0..1 arrays with row sums nondecreasing and column sums unimodal
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1
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4, 26, 147, 751, 3560, 15778, 67030, 274631, 1088767, 4218662, 16015929, 59653826, 219063215, 794078382, 2843032061, 10081383128, 35429305737, 123436612116, 427070556002, 1467917436855, 5013326271265, 17031672794426, 57571509067410
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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
..0..1..0....0..0..1....0..1..0....1..0..0....0..0..1....0..0..0....0..0..1
..0..1..0....1..1..0....1..0..0....0..1..0....0..1..0....0..0..0....1..1..1
..1..0..0....1..1..1....1..0..0....0..0..1....0..0..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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