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A223155 Number of (n+2)X3 0..2 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit 0
99, 989, 16089, 215563, 2616383, 31465359, 363006521, 3765617353, 43008488235, 509667805085, 5518115942960, 58959131052620 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A223157
LINKS
EXAMPLE
Some solutions for n=1
..2..1..1....2..1..2....2..0..2....1..0..2....1..1..2....1..1..2....1..1..2
..0..0..1....1..0..0....1..0..0....0..0..1....0..0..1....0..0..1....0..0..1
..2..1..2....2..0..2....1..1..2....2..1..2....2..0..1....1..0..1....0..0..1
CROSSREFS
Sequence in context: A182672 A124113 A223157 * A308466 A093299 A196645
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 16 2013
STATUS
approved

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Last modified May 30 18:48 EDT 2024. Contains 372974 sequences. (Running on oeis4.)