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A223191
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Number of nX4 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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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..2..0..2....0..1..1..2....2..1..1..1....2..1..1..2....2..1..0..0
..0..0..0..0....0..0..1..1....0..1..0..1....1..1..0..0....0..0..0..0
..2..2..0..0....2..1..1..1....1..1..1..1....0..1..0..2....2..0..0..0
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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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