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A223190
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Number of nX3 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
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0
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16, 256, 1138, 20016, 252544, 3407893, 52906752, 807057750, 12038960562, 208858564343, 3119961979390
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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..0..2....1..0..1....0..0..1....2..1..2....2..0..1....2..1..0....2..1..1
..0..0..2....0..0..1....0..0..0....0..0..1....1..0..0....1..0..1....1..0..1
..0..1..2....2..1..2....1..0..0....2..1..2....2..1..2....0..0..2....0..0..2
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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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