A268141 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one diagonal or antidiagonal neighbor and the top left element equal to 0.

0, 3, 8, 672, 5760, 1411560, 25024320, 11908517040, 361147852800

Offset

1,2

Comments

Column 4 of A268142.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..1..0..3....0..2..0..1....0..3..3..2....0..3..3..0....0..2..3..2
..1..0..3..2....2..0..1..3....3..0..2..3....3..0..0..3....2..0..2..3
..0..3..2..1....0..2..3..1....1..0..2..1....1..2..1..2....3..1..0..1
..3..2..1..2....2..3..1..3....0..1..1..2....2..1..2..1....1..3..1..0

Crossrefs

Cf. A268142.

Sequence in context: A092592 A162185 A297527 * A354119 A278974 A063103

Adjacent sequences: A268138 A268139 A268140 * A268142 A268143 A268144

Keyword

nonn

Author

R. H. Hardin, Jan 27 2016

Status

approved