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A223496
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Number of 3Xn 0..3 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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28, 784, 5264, 164650, 3726450, 89957891, 2474370640, 67279126908, 1776982155124, 53301717502997, 1412061517830650, 38566712740269981, 1093842399226724212, 31131482539555666716
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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
..3..3..3....0..1..2....2..2..3....1..1..2....3..3..3....2..2..3....2..0..2
..2..0..1....0..0..1....0..1..2....1..0..0....2..0..0....1..0..1....0..0..0
..2..1..0....1..0..2....3..2..2....3..2..1....2..0..1....3..0..2....2..2..3
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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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