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A223158
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Number of (n+2)X3 0..3 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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2218, 55790, 2077712, 68181369, 1978616080, 57277247088, 1699357454896, 44365723263555, 1311475160855472, 37755798074253165, 1043288642345317846
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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
..3..1..1....3..1..2....1..1..2....3..0..3....3..2..2....3..0..3....3..1..3
..2..0..1....2..0..0....0..0..2....0..0..1....1..0..0....1..0..1....2..0..2
..2..1..2....3..0..3....1..1..3....3..1..1....3..0..0....3..2..3....2..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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