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 A223190 Number of nX3 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 0
 16, 256, 1138, 20016, 252544, 3407893, 52906752, 807057750, 12038960562, 208858564343, 3119961979390 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A223195 LINKS EXAMPLE Some solutions for n=3 ..1..0..2....1..0..1....0..0..1....2..1..2....2..0..1....2..1..0....2..1..1 ..0..0..2....0..0..1....0..0..0....0..0..1....1..0..0....1..0..1....1..0..1 ..0..1..2....2..1..2....1..0..0....2..1..2....2..1..2....0..0..2....0..0..2 CROSSREFS Sequence in context: A207450 A208552 A267717 * A207469 A207521 A207920 Adjacent sequences: A223187 A223188 A223189 * A223191 A223192 A223193 KEYWORD nonn AUTHOR R. H. Hardin Mar 18 2013 STATUS approved

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Last modified December 1 12:40 EST 2022. Contains 358468 sequences. (Running on oeis4.)