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.

0, 3, 14, 906, 23592, 3304920, 334738800, 79401782880

Offset: 1

Author

R. H. Hardin, Jan 27 2016

Keywords

• nonn

Comments

Column 4 of A268159.

Examples

			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.