A220003 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..3 n X n array

4, 7, 109, 4474, 381745, 83856137

Offset

1,1

Comments

Diagonal of A220010

Links

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

Example

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

Crossrefs

Sequence in context: A136276 A072954 A322723 * A024054 A362857 A289381

Adjacent sequences: A220000 A220001 A220002 * A220004 A220005 A220006

Keyword

nonn

Author

R. H. Hardin Dec 03 2012

Status

approved