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A223651 Number of (n+2)X7 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0
513, 16975, 4854187, 502081983, 47882329200, 4055713784479, 365727640671501, 20518397208263349, 1666402059276661707, 124647566792638712913 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A223652

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A237620 A111344 A230188 * A321565 A017681 A013957

Adjacent sequences:  A223648 A223649 A223650 * A223652 A223653 A223654

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 25 2013

STATUS

approved

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)