A264703 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 6.

2, 15, 296, 9024, 492480, 30233088, 3589152768, 470304423936, 94978179072000

Offset: 1

Author

R. H. Hardin, Nov 21 2015

Keywords

• nonn

Comments

Column 3 of A264704.

Examples

			Some solutions for n=4
..6..0..9....8..6..0....6..0..1....2..6..1....0..8.10....2..0..6....0..9..7
..8..1..3....2..7..1....7..9..3...10..0..7....6..2..4....8..1..3....6..4..1
..4..7..5....4..3..5....8.10..5....4..8..3....1..9.11...10..7..5....2.10..3
.10..2.11...10..9.11....2..4.11...11..5..9....7..3..5....4..9.11....8..5.11
		

Crossrefs

Cf. A264704.