OFFSET
1,2
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 1's
Diagonal of A197307
EXAMPLE
Some solutions for n=4
..0..2..0..2....0..0..1..0....2..0..2..0....0..2..0..2....2..0..0..0
..2..3..2..0....0..1..4..1....0..0..3..2....0..3..2..0....0..2..2..0
..0..0..2..0....0..2..1..0....0..2..2..0....0..2..2..0....0..2..3..0
..0..0..2..0....2..0..2..0....0..2..0..0....2..0..0..2....0..0..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 13 2011
STATUS
approved