A219571 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 n X n array

4, 13, 415, 18564, 2399643, 1391739384

Offset

1,1

Comments

Diagonal of A219578

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A219707 A219822 A048558 * A304545 A316372 A306130

Adjacent sequences: A219568 A219569 A219570 * A219572 A219573 A219574

Keyword

nonn

Author

R. H. Hardin Nov 23 2012

Status

approved