A223193 - OEIS

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A223193

Number of nX6 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

387, 149769, 3407893, 1615611339, 386807892609, 103879396217927, 36214510060655577

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 6 of A223195

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

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

..0..0..0..0..0..1....0..0..0..0..1..1....0..0..0..0..0..1....0..0..0..1..1..1