A223225 Number of nX6 0..1 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

37, 1369, 4656, 251110, 4466304, 137420222, 3725574696, 113910021538, 3513298650108, 152586774462250, 4764924724645664

Offset

1,1

Comments

Column 6 of A223227

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=3
..1..0..0..1..1..1....1..1..0..0..0..0....1..0..0..0..0..1....1..0..1..1..1..1
..1..0..0..1..0..1....1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
..1..1..0..1..0..1....1..0..0..0..0..0....0..1..1..0..0..1....1..0..0..0..0..1

Crossrefs

Sequence in context: A217961 A263372 A206565 * A262763 A188692 A206875

Adjacent sequences: A223222 A223223 A223224 * A223226 A223227 A223228

Keyword

nonn

Author

R. H. Hardin Mar 18 2013

Status

approved