A219464 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..3 n X n array

4, 23, 673, 87083, 43792361, 86755752059, 664221777830589

Offset

1,1

Comments

Diagonal of A219471

Links

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

Example

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

Crossrefs

Sequence in context: A130890 A219932 A266919 * A107765 A304413 A316240

Adjacent sequences: A219461 A219462 A219463 * A219465 A219466 A219467

Keyword

nonn

Author

R. H. Hardin Nov 20 2012

Status

approved