A267018 Number of n X n arrays containing n copies of 0..n-1 with every element equal to or 1 greater than any northeast or northwest neighbors modulo n and the upper left element equal to 0.

1, 3, 15, 137, 2063, 69265, 4893787, 787556232

Offset

1,2

Comments

Diagonal of A267019.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Cf. A267020.

Sequence in context: A195764 A113723 A113379 * A262911 A163949 A005816

Adjacent sequences: A267015 A267016 A267017 * A267019 A267020 A267021

Keyword

nonn

Author

R. H. Hardin, Jan 09 2016

Status

approved