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A223158 Number of (n+2)X3 0..3 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit 0
2218, 55790, 2077712, 68181369, 1978616080, 57277247088, 1699357454896, 44365723263555, 1311475160855472, 37755798074253165, 1043288642345317846 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A223159
LINKS
EXAMPLE
Some solutions for n=1
..3..1..1....3..1..2....1..1..2....3..0..3....3..2..2....3..0..3....3..1..3
..2..0..1....2..0..0....0..0..2....0..0..1....1..0..0....1..0..1....2..0..2
..2..1..2....3..0..3....1..1..3....3..1..1....3..0..0....3..2..3....2..0..2
CROSSREFS
Sequence in context: A234862 A245949 A223159 * A241963 A092992 A210712
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 16 2013
STATUS
approved

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Last modified July 22 16:55 EDT 2024. Contains 374540 sequences. (Running on oeis4.)