A267989 Number of nX3 arrays containing 3 copies of 0..n-1 with row sums and column sums nondecreasing.

1, 5, 145, 7477, 760736, 122958209, 28706571457

Offset

1,2

Comments

Column 3 of A267990.

Links

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

Example

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

Crossrefs

Cf. A267990.

Sequence in context: A254711 A273920 A076218 * A307902 A281427 A294360

Adjacent sequences: A267986 A267987 A267988 * A267990 A267991 A267992

Keyword

nonn

Author

R. H. Hardin, Jan 23 2016

Status

approved