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A266289 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, west or northeast neighbor modulo n and the upper left element equal to 0. 0
1, 0, 2, 9, 435, 20375, 1624164, 170338575, 23301045360, 4006433553814, 845857620264286, 215056002391454266 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A266291.

LINKS

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

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A266291.

Sequence in context: A325619 A049299 A024225 * A000883 A086693 A085605

Adjacent sequences:  A266286 A266287 A266288 * A266290 A266291 A266292

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2015

STATUS

approved

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Last modified January 28 06:29 EST 2020. Contains 331317 sequences. (Running on oeis4.)