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A268117
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 west neighbors modulo n and the upper left element equal to 0.
0
1, 10, 30, 182, 1687, 24745, 586844, 22971957, 1520467020
OFFSET
1,2
COMMENTS
Superdiagonal 1 of A268115.
EXAMPLE
Some solutions for n=6
..0..0..1..2..3..4..4....0..0..1..1..2..3..4....0..1..2..2..3..4..5
..0..1..2..3..3..4..5....0..1..1..2..3..4..5....1..2..3..3..4..5..0
..1..2..2..3..4..5..0....1..1..2..3..4..5..5....2..3..3..4..5..0..1
..1..2..3..4..5..5..0....2..2..2..3..4..5..0....3..4..4..5..0..0..1
..1..2..3..4..5..5..0....2..3..3..4..5..5..0....4..4..5..0..1..1..2
..1..2..3..4..5..0..1....3..4..4..5..0..0..1....5..5..0..1..2..2..3
CROSSREFS
Cf. A268115.
Sequence in context: A335803 A259136 A098684 * A256879 A064012 A276180
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved