A278726 Number of nX7 0..3 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order.

120, 28288, 18151220, 19328645044, 23161560633508, 26947618206791521, 29201160476766771330, 29243132244492451384902

Offset

1,1

Comments

Column 7 of A278727.

Links

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

Example

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

Crossrefs

Cf. A278727.

Sequence in context: A270604 A151604 A104008 * A227667 A054778 A230729

Adjacent sequences: A278723 A278724 A278725 * A278727 A278728 A278729

Keyword

nonn

Author

R. H. Hardin, Nov 27 2016

Status

approved