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A264952 Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal or vertical neighbors. 0
0, 2, 12, 504, 22320, 1521360, 140394240, 17034433920, 2627788262400, 502511002156800, 116684130094963200, 32342603041381248000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A264954.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A264954.

Sequence in context: A013147 A250110 A266501 * A324790 A050643 A145513

Adjacent sequences:  A264949 A264950 A264951 * A264953 A264954 A264955

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2015

STATUS

approved

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Last modified July 31 22:37 EDT 2021. Contains 346377 sequences. (Running on oeis4.)