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A265677 Number of nX2 arrays containing 2 copies of 0..n-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0. 0
1, 1, 4, 23, 209, 2301, 29992, 450525, 7666097, 145748085, 3062086652, 70451319403, 1761725152737, 47575849111097, 1379912569740752, 42782608276446713, 1411969570132526241, 49423093937535984041 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A265679.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

Some solutions for n=4

..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1

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

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

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

CROSSREFS

Cf. A265679.

Sequence in context: A222454 A336948 A099869 * A221371 A056785 A188404

Adjacent sequences:  A265674 A265675 A265676 * A265678 A265679 A265680

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 13 2015

STATUS

approved

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Last modified April 21 23:52 EDT 2021. Contains 343156 sequences. (Running on oeis4.)