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 A223390 Number of (n+2)X3 0..2 arrays with all rows having a nonnegative second derivative, and all 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 0
 388, 5450, 120738, 2326103, 40102656, 663777212, 11304765020, 167298254365, 2855164209146 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A223391 LINKS EXAMPLE Some solutions for n=1 ..2..0..2....2..2..2....2..2..2....2..2..2....2..2..2....2..1..1....0..0..2 ..0..0..1....1..0..1....0..0..1....1..0..0....0..0..0....1..0..0....0..0..1 ..2..1..2....1..0..2....0..1..2....2..0..1....1..1..2....1..0..0....2..1..1 CROSSREFS Sequence in context: A223193 A284147 A234178 * A200970 A104999 A139660 Adjacent sequences:  A223387 A223388 A223389 * A223391 A223392 A223393 KEYWORD nonn AUTHOR R. H. Hardin Mar 19 2013 STATUS approved

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Last modified June 27 12:48 EDT 2022. Contains 354896 sequences. (Running on oeis4.)