A184649 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock having a positive determinant

106449, 3745509, 3745509, 127914873, 398829619, 127914873, 4349714604, 40374310135, 40374310135, 4349714604, 148865535558, 3941878848972, 11808364027889, 3941878848972, 148865535558, 5086456344189, 398138249828378

Offset

1,1

Comments

Table starts

........106449.........3745509........127914873.......4349714604

.......3745509.......398829619......40374310135....3941878848972

.....127914873.....40374310135...11808364027889.3298741433422598

....4349714604...3941878848972.3298741433422598

..148865535558.398138249828378

.5086456344189

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for 5X4
..0..0..2..0....0..0..2..0....0..0..2..0....0..0..2..0....0..0..2..0
..1..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1
..1..1..0..0....0..1..0..0....3..1..0..1....0..1..0..1....0..1..0..1
..3..2..3..0....0..2..3..0....2..3..1..0....1..1..2..0....2..0..3..3
..3..0..1..2....3..2..0..1....3..0..2..1....2..2..3..1....3..1..1..3

Crossrefs

Sequence in context: A242479 A252775 A210410 * A184646 A237542 A237081

Adjacent sequences: A184646 A184647 A184648 * A184650 A184651 A184652

Keyword

nonn,tabl

Author

R. H. Hardin Jan 18 2011

Status

approved