A223388 Number of (n+2)X1 0..2 arrays with all rows having a nonnegative second derivative, and all 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

11, 31, 105, 342, 1044, 3159, 9735, 28302, 87129, 264482, 788647, 2349292, 7156565, 21386626, 64219045, 193101704, 578745219, 1737091402, 5224558074, 15601139099, 46951619088, 141106623033, 422766761598, 1266157491741, 3810620087462

Offset

1,1

Comments

Column 1 of A223391

Links

R. H. Hardin, Table of n, a(n) for n = 1..81

Example

All solutions for n=1
..2....0....2....1....2....0....2....1....1....1....2
..1....0....1....0....0....0....0....0....0....1....0
..2....1....1....2....2....2....0....1....0....2....1

Crossrefs

Sequence in context: A316982 A192246 A124296 * A152220 A272263 A082712

Adjacent sequences: A223385 A223386 A223387 * A223389 A223390 A223391

Keyword

nonn

Author

R. H. Hardin Mar 19 2013

Status

approved