A264661 Number of 3Xn arrays of permutations of 0..n*3-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 5.

1, 8, 314, 20940, 3084352, 726042624, 284038382592

Offset

1,2

Comments

Row 3 of A264659.

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=5
..0..2.10..6..5....0.12..6..2.10....0.10..6..1..7....0.10..7..5..1
..8..7.11..3..1....8..7.11.13..5....8..5.11..9.13....4..2.12..6.11
.14.12..4..9.13....4.14..1..9..3....4.12..2.14..3...14..8.13..9..3

Crossrefs

Cf. A264659.

Sequence in context: A222095 A231124 A081980 * A231781 A220618 A221721

Adjacent sequences: A264658 A264659 A264660 * A264662 A264663 A264664

Keyword

nonn

Author

R. H. Hardin, Nov 20 2015

Status

approved