A264817 Number of nX3 arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 3 and columns nondecreasing modulo 7.

1, 8, 59, 743, 17869, 530230, 16961815, 1040174384

Offset

1,2

Comments

Column 3 of A264818.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=5
..9..0.14....0.10.14....0..1..7....7..1.14....7.14..8....0.14..8....0..7.10
.10..7..2....7..4..1....9..3.14....0..9..8....9..0..2....1..7..4...14..8.11
..3..8.11....2..5..8...12.10..8...10..5..2....3..1.10...10..2.11....1..2..5
.12..1..4....9.13.11....6.11..2....3..6.11....4..5.11...12..9..5....3..9.12
..6.13..5....3..6.12...13..4..5...12.13..4...12..6.13....6..3.13....6..4.13

Crossrefs

Cf. A264818.

Sequence in context: A254662 A186362 A285231 * A032365 A250315 A074423

Adjacent sequences: A264814 A264815 A264816 * A264818 A264819 A264820

Keyword

nonn

Author

R. H. Hardin, Nov 25 2015

Status

approved