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A223494 Number of (n+2)X3 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 0
5264, 172262, 7974566, 332428881, 12184078320, 451243568715, 17182947501552, 579662929049292, 21956435216459537 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A223495
LINKS
EXAMPLE
Some solutions for n=1
..3..2..1....2..0..3....0..0..1....3..1..3....2..1..2....1..0..1....1..0..0
..1..0..0....2..1..1....0..0..1....2..0..0....1..0..2....0..0..0....1..0..0
..1..0..1....3..3..3....3..2..2....3..0..3....3..0..3....0..1..2....2..1..1
CROSSREFS
Sequence in context: A204281 A251901 A274361 * A265985 A234994 A223341
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved

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Last modified April 16 19:48 EDT 2024. Contains 371754 sequences. (Running on oeis4.)