A264641 Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 3 and columns nondecreasing modulo 4.

1, 1, 6, 30, 284, 2344, 31632, 492432, 12098624, 236007424, 6065647616, 159458086912, 6086725226496, 260007588237312

Offset

1,3

Comments

Column 2 of A264643.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A264643.

Sequence in context: A205339 A215288 A295611 * A360824 A110374 A360831

Adjacent sequences: A264638 A264639 A264640 * A264642 A264643 A264644

Keyword

nonn

Author

R. H. Hardin, Nov 19 2015

Status

approved