A265004 Number of nX7 arrays of permutations of 7 copies of 0..n-1 with rows and columns nondecreasing.

1, 4, 54, 1720, 97341, 8360853, 1001060834, 155796077603, 30055866217955

Offset

1,2

Comments

Column 7 of A265005.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..0..0..0..0..0..2....0..0..0..0..0..0..1....0..0..0..1..1..2..2
..0..1..1..1..1..2..2....0..1..1..2..2..2..2....0..0..1..1..1..2..2
..1..1..2..2..3..3..3....1..1..1..2..2..2..3....0..1..1..2..2..3..3
..1..2..2..3..3..3..3....1..3..3..3..3..3..3....0..2..3..3..3..3..3

Crossrefs

Cf. A265005.

Sequence in context: A369569 A201731 A225823 * A284747 A003955 A182264

Adjacent sequences: A265001 A265002 A265003 * A265005 A265006 A265007

Keyword

nonn

Author

R. H. Hardin, Nov 29 2015

Status

approved