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A223192 Number of nX5 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0
138, 19044, 252544, 41164952, 3815358480, 386807892609, 49198404222036, 6403019500770522 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A223195

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

..1..2..0..2..2....1..1..1..0..1....0..1..0..0..2....1..1..0..2..2

..0..1..1..0..2....0..0..0..0..0....1..0..1..0..0....1..1..0..0..1

..1..0..2..1..2....1..0..0..2..0....2..2..2..2..2....1..2..1..1..2

CROSSREFS

Sequence in context: A279964 A163693 A089518 * A199839 A005447 A261703

Adjacent sequences: A223189 A223190 A223191 * A223193 A223194 A223195

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2013

STATUS

approved

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Last modified February 4 22:05 EST 2023. Contains 360082 sequences. (Running on oeis4.)