A267070 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west or southwest neighbor modulo n and the upper left element equal to 0.

1, 0, 2, 44, 1949, 119544, 9966710, 1094087602, 153634294614, 26915214507240, 5760519575052132, 1479878539858828536

Offset

1,3

Comments

Column 2 of A267072.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..0..0....0..3....0..3....0..2....0..2....0..3....0..2....0..2....0..2....0..3
..2..2....0..2....3..2....0..2....0..2....1..1....0..3....3..1....3..1....0..2
..3..1....2..1....2..1....3..3....3..1....2..2....1..1....3..1....1..3....3..1
..1..3....3..1....1..0....1..1....1..3....0..3....3..2....2..0....0..2....2..1

Crossrefs

Cf. A267072.

Sequence in context: A140795 A161744 A208045 * A054732 A161722 A290879

Adjacent sequences: A267067 A267068 A267069 * A267071 A267072 A267073

Keyword

nonn

Author

R. H. Hardin, Jan 10 2016

Status

approved