A264562 Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 3.

1, 15, 888, 84672, 17444160, 5356808640, 2800372248576

Offset: 1

Author

R. H. Hardin, Nov 17 2015

Keywords

• nonn

Comments

Row 3 of A264560.

Examples

			Some solutions for n=4
..6..7..9..3....0.10..6..9....6.10..0..1....0.10..6..4....6..9..7..1
..4.10..2..0....7..1..3.11....9..5..3..7....2.11..3..7....0..3.11..5
..8..1..5.11....2..8..4..5....4..2..8.11....8..5..9..1...10..4..2..8
		

Crossrefs

Cf. A264560.