A219679 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X n array

3, 4, 31, 427, 8964, 344926, 35011623, 10451333258

Offset

1,1

Comments

Diagonal of A219686

Links

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

Example

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

Crossrefs

Sequence in context: A372794 A058603 A042653 * A042431 A269724 A296250

Adjacent sequences: A219676 A219677 A219678 * A219680 A219681 A219682

Keyword

nonn

Author

R. H. Hardin Nov 25 2012

Status

approved