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A267070 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its west or southwest neighbor modulo n and the upper left element equal to 0. 0
1, 0, 2, 44, 1949, 119544, 9966710, 1094087602, 153634294614, 26915214507240, 5760519575052132, 1479878539858828536 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A267072.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A267072.

Sequence in context: A140795 A161744 A208045 * A054732 A161722 A290879

Adjacent sequences:  A267067 A267068 A267069 * A267071 A267072 A267073

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2016

STATUS

approved

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Last modified August 3 13:49 EDT 2020. Contains 336198 sequences. (Running on oeis4.)