A219920 Number of 7Xn arrays of the minimum value of corresponding elements and their horizontal, diagonal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 7Xn array

28, 57, 789, 7877, 76385, 715430, 6705546, 63193592

Offset

1,1

Comments

Row 7 of A219915

Links

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

Example

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

Crossrefs

Sequence in context: A042560 A042562 A042564 * A219216 A042566 A132769

Adjacent sequences: A219917 A219918 A219919 * A219921 A219922 A219923

Keyword

nonn

Author

R. H. Hardin Dec 01 2012

Status

approved