A223159 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit

2218, 55790, 55790, 2077712, 5026270, 2077712, 68181369, 765677906, 765677906, 68181369, 1978616080, 102504263355, 566068245194, 102504263355, 1978616080, 57277247088, 11137517145396, 350946216811545, 350946216811545

Offset

1,1

Comments

Table starts

........2218..........55790.........2077712........68181369.....1978616080

.......55790........5026270.......765677906....102504263355.11137517145396

.....2077712......765677906....566068245194.350946216811545

....68181369...102504263355.350946216811545

..1978616080.11137517145396

.57277247088

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

Some solutions for n=1 k=4
..1..2..0..0..1..0....1..2..1..0..0..1....1..1..1..0..3..1....1..0..0..0..2..1
..0..0..0..0..1..1....0..0..0..0..0..1....0..0..0..0..0..1....0..0..0..0..1..1
..2..1..2..1..3..3....2..2..1..3..1..2....3..3..1..1..1..2....3..2..1..2..3..3

Crossrefs

Sequence in context: A234867 A234862 A245949 * A223158 A241963 A092992

Adjacent sequences: A223156 A223157 A223158 * A223160 A223161 A223162

Keyword

nonn,tabl

Author

R. H. Hardin Mar 16 2013

Status

approved