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A223493 Number of (n+2)X2 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 1
784, 11236, 217156, 3880900, 62473216, 1017418609, 16958290176, 258624119601, 4292106627600, 69919047021121, 1108508414832900, 17553241318913316, 287190892511175249, 4569212447729997376, 73203072358679636409 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A223495
LINKS
EXAMPLE
Some solutions for n=1
..1..3....2..0....2..2....2..0....0..1....3..1....3..3....1..3....2..1....1..0
..0..2....0..0....2..0....2..0....0..0....0..1....2..2....0..1....1..1....1..0
..0..2....0..2....3..2....3..1....3..1....2..2....2..3....3..2....3..3....3..3
CROSSREFS
Sequence in context: A250809 A255145 A203790 * A231976 A188782 A184601
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 20 2013
STATUS
approved

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Last modified April 19 14:50 EDT 2024. Contains 371792 sequences. (Running on oeis4.)