A220038 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 n X n array.

4, 13, 184, 8337, 904715, 310371126

Offset

1,1

Comments

Diagonal of A220044

Links

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

Example

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

Crossrefs

Sequence in context: A198159 A322659 A042537 * A394318 A132512 A203221

Adjacent sequences: A220035 A220036 A220037 * A220039 A220040 A220041

Keyword

nonn

Author

R. H. Hardin, Dec 03 2012

Status

approved