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A266570 Number of nX2 arrays containing 2 copies of 0..n-1 with no element 1 greater than its northwest or southwest neighbor modulo n and the upper left element equal to 0. 0
1, 1, 5, 74, 2668, 150836, 12011058, 1279437414, 175836809388, 30308775142980, 6404886614932128 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A266572.

LINKS

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

EXAMPLE

Some solutions for n=6

..0..4....0..3....0..1....0..3....0..4....0..1....0..0....0..1....0..3....0..1

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

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

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

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

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

CROSSREFS

Cf. A266572.

Sequence in context: A251666 A192564 A080473 * A156703 A285452 A048350

Adjacent sequences:  A266567 A266568 A266569 * A266571 A266572 A266573

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 01 2016

STATUS

approved

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Last modified May 7 19:02 EDT 2021. Contains 343652 sequences. (Running on oeis4.)