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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.
2
1, 5, 21, 259, 5493, 255437, 26320280, 6071784885
OFFSET
1,2
COMMENTS
Subdiagonal 1 of A267019.
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
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Jan 09 2016
STATUS
approved