A267900 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0.

1, 11, 268, 17658, 1696920, 273460560, 59383337040

Offset: 1

Author

R. H. Hardin, Jan 22 2016

Keywords

• nonn

Comments

Column 4 of A267901.

Examples

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

Crossrefs

Cf. A267901.