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A265419 Number of nX2 arrays containing 2 copies of 0..n-1 with no equal horizontal, vertical, diagonal or antidiagonal neighbors and new values introduced sequentially from 0. 0
0, 0, 0, 4, 48, 584, 8096, 127296, 2241856, 43770144, 939182976, 21981580224, 557527020544, 15236894019072, 446459870047232, 13964134704426752, 464407462322500608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 2 of A265421.

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=6

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

..2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3....2..3

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

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

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

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

CROSSREFS

Cf. A265421.

Sequence in context: A099671 A196963 A220325 * A226705 A126967 A098402

Adjacent sequences:  A265416 A265417 A265418 * A265420 A265421 A265422

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 08 2015

STATUS

approved

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Last modified June 23 17:39 EDT 2021. Contains 345402 sequences. (Running on oeis4.)