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A266919 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, southwest or southeast neighbor modulo n and the upper left element equal to 0. 0
1, 0, 4, 23, 398, 23432, 1841274, 193070360, 26165335486, 4456558300940, 932617500467182 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A266921.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=6

..0..1....0..2....0..0....0..3....0..3....0..5....0..2....0..5....0..5....0..4

..4..1....5..0....2..4....4..1....4..2....2..3....5..2....3..2....3..1....2..3

..2..0....3..5....2..3....3..5....3..1....0..3....4..1....5..1....2..4....5..3

..4..3....3..1....4..5....2..1....1..5....4..1....3..4....4..0....2..4....1..5

..3..5....2..1....3..1....4..5....5..2....2..1....1..0....4..2....5..3....0..2

..2..5....4..4....1..5....0..2....4..0....5..4....3..5....3..1....1..0....4..1

CROSSREFS

Cf. A266921.

Sequence in context: A130890 A138578 A219932 * A219464 A107765 A304413

Adjacent sequences:  A266916 A266917 A266918 * A266920 A266921 A266922

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2016

STATUS

approved

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Last modified January 20 19:53 EST 2020. Contains 331096 sequences. (Running on oeis4.)