A267020 Number of (n+1)Xn arrays containing n copies of 0..n 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, 5, 21, 259, 5493, 255437, 26320280, 6071784885

Offset

1,2

Comments

Subdiagonal 1 of A267019.

Links

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

Example

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

Crossrefs

Cf. A267020.

Sequence in context: A195963 A119686 A241467 * A141798 A301797 A015461

Adjacent sequences: A267017 A267018 A267019 * A267021 A267022 A267023

Keyword

nonn,more

Author

R. H. Hardin, Jan 09 2016

Status

approved