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A223155
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Number of (n+2)X3 0..2 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit
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0
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99, 989, 16089, 215563, 2616383, 31465359, 363006521, 3765617353, 43008488235, 509667805085, 5518115942960, 58959131052620
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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=1
..2..1..1....2..1..2....2..0..2....1..0..2....1..1..2....1..1..2....1..1..2
..0..0..1....1..0..0....1..0..0....0..0..1....0..0..1....0..0..1....0..0..1
..2..1..2....2..0..2....1..1..2....2..1..2....2..0..1....1..0..1....0..0..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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