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A268158 Number of nX4 arrays of permutations of 4 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, 3, 14, 906, 23592, 3304920, 334738800, 79401782880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A268159.

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A268159.

Sequence in context: A264748 A092987 A088334 * A050645 A048568 A119678

Adjacent sequences:  A268155 A268156 A268157 * A268159 A268160 A268161

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2016

STATUS

approved

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Last modified September 23 13:55 EDT 2017. Contains 292358 sequences.