OFFSET
1,2
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 2's, every 3 is next to 3 1's, every 4 is next to 4 4's.
Diagonal of A196485.
EXAMPLE
Some solutions for n=4
..2..2..1..0....2..2..2..2....1..0..0..0....1..0..0..0....1..0..0..0
..2..2..1..1....2..0..1..2....1..2..2..2....1..2..2..0....2..2..0..0
..0..0..0..1....2..0..1..2....0..2..0..2....0..2..2..0....2..2..0..0
..0..0..0..1....2..2..2..2....1..2..2..2....1..1..0..0....0..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 03 2011
STATUS
approved