A223493 Number of (n+2)X2 0..3 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

784, 11236, 217156, 3880900, 62473216, 1017418609, 16958290176, 258624119601, 4292106627600, 69919047021121, 1108508414832900, 17553241318913316, 287190892511175249, 4569212447729997376, 73203072358679636409

Offset

1,1

Comments

Column 2 of A223495

Links

R. H. Hardin, Table of n, a(n) for n = 1..30

Example

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

Crossrefs

Sequence in context: A250809 A255145 A203790 * A231976 A188782 A184601

Adjacent sequences: A223490 A223491 A223492 * A223494 A223495 A223496

Keyword

nonn

Author

R. H. Hardin Mar 20 2013

Status

approved