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A266902 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its north, west or southwest neighbor modulo n and the upper left element equal to 0. 0
1, 0, 1, 13, 331, 17651, 1386377, 148410280, 20588092054, 3584553946578, 764734875953730, 196150243865801221 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 2 of A266904.

LINKS

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

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A266904.

Sequence in context: A348087 A142543 A258297 * A029807 A097308 A204195

Adjacent sequences:  A266899 A266900 A266901 * A266903 A266904 A266905

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2016

STATUS

approved

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Last modified January 22 00:08 EST 2022. Contains 350481 sequences. (Running on oeis4.)