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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

Table of n, a(n) for n=1..12.

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

Adjacent sequences:  A223152 A223153 A223154 * A223156 A223157 A223158

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2013

STATUS

approved

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Last modified October 7 06:14 EDT 2022. Contains 357270 sequences. (Running on oeis4.)