A266316 Number of n X 2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west or north neighbor modulo n and the upper left element equal to 0.

1, 0, 2, 35, 1007, 54819, 4318217, 458508379, 62976460150, 10860600443527, 2297243685069637, 584799993257765106

Offset

1,3

Comments

Column 2 of A266318.

Links

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

Example

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

Crossrefs

Cf. A266318.

Sequence in context: A277294 A191807 A245052 * A110697 A322514 A132100

Adjacent sequences: A266313 A266314 A266315 * A266317 A266318 A266319

Keyword

nonn,more

Author

R. H. Hardin, Dec 27 2015

Status

approved