|
|
A222449
|
|
Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order.
|
|
0
|
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..1
..0..0..1..0....0..0..0..0....0..0..0..1....0..0..0..1....0..1..1..1
..0..0..0..0....1..1..0..0....0..0..0..0....1..1..1..1....1..1..1..1
..0..0..0..0....1..1..0..0....0..0..1..0....1..1..1..1....0..1..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|