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A223223
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Number of nX4 0..1 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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11, 121, 280, 3926, 26376, 251110, 2272864, 22449494, 215688364, 2635210346, 26127577834, 269923989830, 2987354654601, 35395852343115
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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..1..0..0....1..0..1..1....1..1..1..1....1..1..0..1....1..0..0..1
..0..0..0..0....1..0..0..1....1..0..0..0....1..0..0..0....1..0..0..1
..0..0..1..1....1..1..0..1....1..0..1..0....1..0..0..0....1..1..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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