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A265660 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any horizontal or vertical neighbor equal to n-1. 0
0, 0, 0, 112, 4912, 265440, 31924032, 3170361984, 597787563264, 97379218955520, 26489701471180800, 6432079809975552000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 2 of A265663.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A265663.

Sequence in context: A172129 A304552 A103860 * A271032 A213803 A291214

Adjacent sequences:  A265657 A265658 A265659 * A265661 A265662 A265663

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 12 2015

STATUS

approved

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Last modified August 23 00:50 EDT 2019. Contains 326211 sequences. (Running on oeis4.)