A267162 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west, southwest or northwest neighbor modulo n and the upper left element equal to 0.

1, 0, 0, 8, 411, 30362, 2742512, 317221226, 46165940578, 8303305172988, 1813340078934264

Offset

1,4

Comments

Column 2 of A267163.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A267163.

Sequence in context: A008274 A188422 A188393 * A193372 A368002 A185833

Adjacent sequences: A267159 A267160 A267161 * A267163 A267164 A267165

Keyword

nonn

Author

R. H. Hardin, Jan 11 2016

Status

approved