OFFSET
1,2
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 3's
Diagonal of A197207
EXAMPLE
Some solutions for n=4
..1..1..2..1....0..0..0..0....1..2..0..0....0..1..2..1....0..0..1..0
..2..0..0..0....0..1..0..0....0..1..0..0....0..0..0..0....0..1..2..0
..1..0..1..0....0..2..1..0....0..0..0..3....1..2..0..3....0..3..0..3
..0..0..2..1....1..2..1..0....0..3..0..0....0..1..0..0....0..0..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 11 2011
STATUS
approved