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 A223176 Number of (n+2)X4 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit 0
 0, 4, 40, 348, 1200, 16348, 94364, 524292, 2621432, 16536796, 84487288, 391704968, 2328596100, 11355881256, 62051315756, 313489275420, 1569528616420, 8055413661476 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A223179 LINKS EXAMPLE All solutions for n=2 ..1..0..1..1....1..1..0..1....1..1..0..1....1..0..1..1 ..1..0..0..0....1..0..0..0....0..0..0..1....0..0..0..1 ..0..0..0..1....0..0..0..1....1..0..0..0....1..0..0..0 ..1..1..0..1....1..0..1..1....1..0..1..1....1..1..0..1 CROSSREFS Sequence in context: A121126 A145730 A069721 * A279574 A327675 A191681 Adjacent sequences:  A223173 A223174 A223175 * A223177 A223178 A223179 KEYWORD nonn AUTHOR R. H. Hardin Mar 17 2013 STATUS approved

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Last modified October 15 19:25 EDT 2019. Contains 328037 sequences. (Running on oeis4.)