A264792 Number of nX2 arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 7.

1, 3, 6, 23, 112, 561, 3519, 39132, 437312, 4828352, 70006528, 1118710784, 17726058496, 298648682496, 7527505969152

Offset

1,2

Comments

Column 2 of A264794.

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=7
..0..7....7..1....0..8....9..7....0..8....8..0....7..1....0..8....8..7....7..1
..1..9....0..8....7..1....2..0....7..3....2..7....0..8....7..1....2..0....0..9
..8..3....9..3...10..2....4..8....1.11....4..1....2..3....2..9...10..1....8.10
..2.11....2..4....3..9...11..1....2.12....5..9....9.11....3.11....3..9....2..3
.10.12...10.11....4.12...12.10....9..5...12.10...10.12...10..5....4.11...12..4
..4..6...12..6...11..5....6..3...10..6...13..3....4..6....4..6...13..5....6.11
..5.13....5.13....6.13...13..5....4.13....6.11....5.13...12.13....6.12...13..5

Crossrefs

Cf. A264794.

Sequence in context: A013217 A013216 A013210 * A013215 A013211 A013212

Adjacent sequences: A264789 A264790 A264791 * A264793 A264794 A264795

Keyword

nonn

Author

R. H. Hardin, Nov 25 2015

Status

approved