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A268114
Number of n X n arrays containing n copies of 0..n-1 with every element equal to or 1 greater than any north or west neighbors modulo n and the upper left element equal to 0.
0
1, 3, 8, 25, 111, 761, 9204, 194567, 7088277, 450354517
OFFSET
1,2
COMMENTS
Diagonal of A268115.
EXAMPLE
Some solutions for n=6
..0..1..2..3..4..5....0..0..1..1..2..2....0..1..1..2..2..2....0..1..2..2..3..4
..0..1..2..3..4..5....1..1..2..2..3..3....1..1..2..3..3..3....1..1..2..3..4..5
..1..2..3..4..5..0....2..2..3..3..4..4....1..2..3..4..4..4....2..2..3..4..5..0
..2..3..4..5..0..1....3..3..4..4..5..5....2..3..4..5..5..5....3..3..4..5..0..1
..2..3..4..5..0..1....4..4..5..5..0..0....3..4..5..5..0..0....3..4..5..5..0..1
..2..3..4..5..0..1....5..5..0..0..1..1....4..5..0..0..0..1....4..5..0..0..1..2
CROSSREFS
Cf. A268115.
Sequence in context: A184325 A051403 A004205 * A097713 A009392 A130648
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved