A266652 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its northeast neighbor modulo n and the upper left element equal to 0.

1, 1, 11, 234, 8466, 465690, 36290610, 3806425980, 517149634680, 88352470838520, 18539220178017000, 4687139017126566000

Offset

1,3

Comments

Column 2 of A266655.

Links

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

Example

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

Crossrefs

Cf. A266655.

Sequence in context: A142120 A252893 A139229 * A142672 A158297 A296170

Adjacent sequences: A266649 A266650 A266651 * A266653 A266654 A266655

Keyword

nonn

Author

R. H. Hardin, Jan 02 2016

Status

approved