A264561 Number of 2Xn arrays of permutations of 0..n*2-1 with rows nondecreasing modulo 2 and columns nondecreasing modulo 3.

1, 3, 24, 316, 6080, 149824, 5728896, 259780608, 14154310656, 1054215834624, 89916231499776, 8598005149335552, 1060188396237619200, 143949911784652800000, 21558056502951936000000, 3945027400881831936000000, 787329097621521039360000000, 169045708782037015461888000000

Offset

1,2

Comments

Row 2 of A264560.

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Cf. A264560.

Sequence in context: A138428 A047056 A343445 * A003236 A232693 A319939

Adjacent sequences: A264558 A264559 A264560 * A264562 A264563 A264564

Keyword

nonn

Author

R. H. Hardin, Nov 17 2015

Extensions

More terms from Bert Dobbelaere, May 10 2026

Status

approved