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A265867 Number of nX2 arrays containing 2 copies of 0..n-1 with no element plus any antidiagonal neighbor equal to n-1. 0
1, 2, 42, 984, 48216, 2869200, 278125200, 31015797120, 4991834736000, 896085889171200, 215916261060729600, 56895400548095155200 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 2 of A265870.
LINKS
EXAMPLE
Some solutions for n=4
..0..3....0..2....3..0....1..0....3..0....2..1....0..3....3..3....1..2....1..1
..2..0....0..1....0..2....2..0....2..0....3..3....3..1....2..1....2..0....3..3
..1..2....3..1....2..3....2..1....2..1....1..0....1..2....1..2....0..1....2..0
..3..1....3..2....1..1....3..3....1..3....2..0....2..0....0..0....3..3....0..2
CROSSREFS
Cf. A265870.
Sequence in context: A276923 A308526 A162678 * A259550 A177456 A360238
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2015
STATUS
approved

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Last modified April 18 10:01 EDT 2024. Contains 371779 sequences. (Running on oeis4.)