A264999 Number of n X n arrays containing n copies of 0..n-1 with rows and columns nondecreasing.

1, 2, 7, 112, 4919, 1268728, 1001060834, 4031708477982

Offset

1,2

Comments

Diagonal of A265005.

Links

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

Example

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

Crossrefs

Cf. A265005.

Sequence in context: A045310 A224445 A000157 * A326940 A326964 A034902

Adjacent sequences: A264996 A264997 A264998 * A265000 A265001 A265002

Keyword

nonn

Author

R. H. Hardin, Nov 29 2015

Status

approved