A265372 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with no equal horizontal, vertical or antidiagonal neighbors and new values introduced sequentially from 0.

0, 0, 1, 236, 363850, 860077644, 3040856393843, 15614173687644042

Offset

1,4

Comments

Column 4 of A265373.

Links

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

Example

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

Crossrefs

Cf. A265373.

Sequence in context: A233243 A233200 A233221 * A252718 A036270 A217030

Adjacent sequences: A265369 A265370 A265371 * A265373 A265374 A265375

Keyword

nonn

Author

R. H. Hardin, Dec 07 2015

Status

approved