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

513, 16975, 4854187, 502081983, 47882329200, 4055713784479, 365727640671501, 20518397208263349, 1666402059276661707, 124647566792638712913

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 * A353942 A351272 A321565

Adjacent sequences: A223648 A223649 A223650 * A223652 A223653 A223654

Keyword

nonn

Author

R. H. Hardin Mar 25 2013

Status

approved