A223192 Number of nX5 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

138, 19044, 252544, 41164952, 3815358480, 386807892609, 49198404222036, 6403019500770522

Offset

1,1

Comments

Column 5 of A223195

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..1..2..0..2..2....1..1..1..0..1....0..1..0..0..2....1..1..0..2..2
..0..1..1..0..2....0..0..0..0..0....1..0..1..0..0....1..1..0..0..1
..1..0..2..1..2....1..0..0..2..0....2..2..2..2..2....1..2..1..1..2

Crossrefs

Sequence in context: A279964 A163693 A089518 * A199839 A005447 A261703

Adjacent sequences: A223189 A223190 A223191 * A223193 A223194 A223195

Keyword

nonn

Author

R. H. Hardin Mar 18 2013

Status

approved