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A223655
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Number of 5Xn 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive 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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13, 169, 343, 5751, 40981, 427313, 4854187, 44756637, 495471093, 7057443515, 81567865207, 907308467643, 12030980609035, 175766023364757
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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..1....0..0..1....1..1..1....1..1..1....1..1..1....1..1..1....1..1..1
..1..0..0....1..1..1....1..0..1....1..0..1....1..0..0....1..0..1....0..0..0
..1..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..1....1..0..1
..0..0..1....0..0..0....0..0..0....1..1..1....1..1..1....1..0..0....1..0..1
..1..0..1....1..1..1....1..1..1....1..0..1....1..1..1....1..1..1....1..1..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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