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A268157 Number of nX3 arrays containing 3 copies of 0..n-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0. 1
0, 1, 8, 36, 456, 6360, 93600, 1784160, 38102400, 899579520, 23960966400, 699741504000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 3 of A268159.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268159.

Sequence in context: A181072 A058823 A244301 * A203020 A276175 A050536

Adjacent sequences:  A268154 A268155 A268156 * A268158 A268159 A268160

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2016

STATUS

approved

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Last modified August 4 16:10 EDT 2021. Contains 346447 sequences. (Running on oeis4.)