A265854 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal or antidiagonal neighbor equal to n-1.

0, 0, 10, 248, 14928, 829824, 90999072, 9589855104, 1679970554880, 287741257800960, 73925012711635200, 18719082274603622400

Offset

1,3

Comments

Column 2 of A265856.

Links

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

Example

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

Crossrefs

Cf. A265856.

Sequence in context: A268545 A211093 A108792 * A128013 A178021 A134262

Adjacent sequences: A265851 A265852 A265853 * A265855 A265856 A265857

Keyword

nonn

Author

R. H. Hardin, Dec 16 2015

Status

approved