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

1,2

Comments

Row 2 of A264638.

Links

Table of n, a(n) for n=1..11.

Example

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.

Sequence in context: A161605 A048954 A086569 * A298696 A359917 A143636

Adjacent sequences: A264636 A264637 A264638 * A264640 A264641 A264642

Keyword

nonn

Author

R. H. Hardin, Nov 19 2015

Status

approved