A223224 Number of nX5 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

19, 361, 1036, 26376, 278904, 4466304, 67584976, 1093365880, 17888793702, 382511445066, 6457494717192, 111640301736128, 2145914064012167, 44670752146501913

Offset

1,1

Comments

Column 5 of A223227

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A208504 A207877 A207680 * A207893 A207883 A207760

Adjacent sequences: A223221 A223222 A223223 * A223225 A223226 A223227

Keyword

nonn

Author

R. H. Hardin Mar 18 2013

Status

approved