A264639 Number of 2 X n arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.

1, 3, 28, 400, 7776, 229392, 9082368, 481406976, 30249676800, 2458667520000, 229405685760000

Offset: 1

Author

R. H. Hardin, Nov 19 2015

Keywords

• nonn

Comments

Row 2 of A264638.

Examples

			Some solutions for n=4
..4..2..6..5....4..0..6..5....2..0..4..5....4..0..2..1....2..0..4..1
..0..3..7..1....2..3..7..1....6..7..3..1....6..5..3..7....6..7..5..3
		

Crossrefs

Cf. A264638.