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A267554
Number of nX(n+1) arrays of permutations of n+1 copies of 0..n-1 with every element equal to or 1 greater than any north or northeast neighbors modulo n and the upper left element equal to 0.
0
1, 10, 20, 61, 287, 2041, 21781, 345853, 8152191, 287657725
OFFSET
1,2
COMMENTS
Superdiagonal 1 of A267553.
EXAMPLE
Some solutions for n=4
..0..0..1..1..1....0..1..1..2..3....0..1..2..2..3....0..0..1..1..2
..0..1..2..2..2....1..2..2..3..0....1..2..3..3..0....0..1..1..2..3
..1..2..3..3..3....2..2..3..0..0....2..3..0..0..1....1..2..2..3..3
..2..3..3..0..0....3..3..0..1..1....3..0..1..1..2....2..3..3..0..0
CROSSREFS
Cf. A267553.
Sequence in context: A271512 A294473 A174183 * A337434 A328490 A131726
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2016
STATUS
approved