A265231 Number of nX4 arrays of permutations of 4 copies of 0..n-1 with no equal vertical neighbors and new values introduced sequentially from 0.

1, 8, 495, 184740, 164933040, 277778385204, 785263649477535

Offset: 1

Author

R. H. Hardin, Dec 06 2015

Keywords

• nonn

Comments

Column 4 of A265232.

Examples

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

Crossrefs

Cf. A265232.