A264640 Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.

1, 16, 960, 107568, 21565440, 10027929600, 7163873280000

Offset: 1

Author

R. H. Hardin, Nov 19 2015

Keywords

• nonn

Comments

Row 3 of A264638.

Examples

			Some solutions for n=4
..0..4..6..8....8..6..0..1....4..2..8..1....8..4..9..1....0..8..5..1
..2..1.11..9....4..2..5..9....0..6.10..9....0..6.10..5....4..6.10..9
.10..5..3..7...10..7.11..3...11..3..7..5....2..7.11..3....2..7.11..3
		

Crossrefs

Cf. A264638.