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A266040 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any vertical or antidiagonal neighbor equal to n-1. 0
1, 0, 8, 104, 6440, 312960, 36965712, 3615441408, 668391093888, 108118788084480, 29018593889026560, 7014015968947706880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A266042.

LINKS

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

EXAMPLE

Some solutions for n=4

..2..2....3..0....0..0....3..3....3..2....1..2....2..2....3..2....2..0....3..3

..3..0....1..1....2..1....1..1....3..0....3..0....0..0....2..0....2..1....2..1

..1..1....3..0....3..3....0..0....1..0....2..1....1..1....0..1....0..3....0..0

..0..3....2..2....2..1....2..2....1..2....0..3....3..3....1..3....1..3....1..2

CROSSREFS

Cf. A266042.

Sequence in context: A141383 A034300 A266044 * A146346 A285745 A119934

Adjacent sequences:  A266037 A266038 A266039 * A266041 A266042 A266043

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved

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Last modified December 3 02:46 EST 2021. Contains 349445 sequences. (Running on oeis4.)