A266125 Number of n X n integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors exactly one smaller than itself.

1, 9, 77, 572, 62104, 13689944, 10444421518

Offset

1,2

Comments

Diagonal of A266131.

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Cf. A266131.

Sequence in context: A330630 A282327 A263471 * A290708 A126631 A190981

Adjacent sequences: A266122 A266123 A266124 * A266126 A266127 A266128

Keyword

nonn

Author

R. H. Hardin, Dec 21 2015

Status

approved