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A264639
Number of 2 X n arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 4.
0
1, 3, 28, 400, 7776, 229392, 9082368, 481406976, 30249676800, 2458667520000, 229405685760000
OFFSET
1,2
COMMENTS
Row 2 of A264638.
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2015
STATUS
approved