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A267337
Number of n X n arrays containing n copies of 0..n-1 with every element equal to or 1 greater than any north, west or southwest neighbors modulo n and the upper left element equal to 0.
1
1, 3, 5, 12, 36, 135, 649, 4277, 39472, 505780, 9112713
OFFSET
1,2
COMMENTS
Diagonal of A267338.
EXAMPLE
Some solutions for n=4
..0..1..1..2....0..1..2..3....0..0..1..2....0..1..2..3....0..1..2..3
..0..1..2..3....0..1..2..3....0..1..2..3....1..2..3..0....1..1..2..3
..1..2..3..0....0..1..2..3....0..1..2..3....2..3..0..1....1..2..3..0
..2..3..3..0....1..2..3..0....1..2..3..3....2..3..0..1....2..3..0..0
CROSSREFS
Cf. A267338.
Sequence in context: A087610 A243013 A191636 * A308544 A307142 A291936
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2016
STATUS
approved