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A269477 Number of nX2 arrays containing 2 copies of 0..n-1 avoiding the pattern down-up in every row and equal-up in every column. 1
1, 6, 54, 600, 9102, 188472, 5118012, 172101936, 6887210886, 321643938456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A269479.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A269479.

Sequence in context: A186375 A231554 A069726 * A305602 A081132 A158831

Adjacent sequences:  A269474 A269475 A269476 * A269478 A269479 A269480

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 27 2016

STATUS

approved

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Last modified November 14 22:17 EST 2019. Contains 329134 sequences. (Running on oeis4.)