A228979 Number of n X n 0..1 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1)X(n+1) 0..1 array.

2, 16, 512, 56472, 20729216, 25205141664, 102496979446048, 1399175578116323192, 64226272780209688718776

Offset

1,1

Comments

Diagonal of A228986.

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..0..1..0....0..0..1..1....1..1..0..1....1..1..1..0....0..0..0..1
..1..0..1..0....1..1..0..0....0..0..0..1....1..1..0..1....0..0..0..1
..1..1..0..0....1..0..1..0....1..1..0..0....0..1..0..0....1..0..1..0
..1..1..1..0....1..0..1..1....1..1..1..1....0..1..0..1....0..0..1..0

Crossrefs

Sequence in context: A267728 A063387 A326251 * A366514 A293150 A286039

Adjacent sequences: A228976 A228977 A228978 * A228980 A228981 A228982

Keyword

nonn

Author

R. H. Hardin, Sep 10 2013

Status

approved