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 2's, every 3 is next to 3 0's, every 4 is next to 4 2's
Diagonal of A197648
EXAMPLE
Some solutions for n=4
..0..0..1..1....0..0..3..0....2..2..2..1....0..2..2..0....2..2..2..1
..3..0..2..2....0..3..0..0....2..4..2..0....0..2..2..1....2..0..2..1
..0..1..2..2....1..2..2..0....2..2..2..0....0..0..1..0....2..2..2..1
..0..0..0..1....0..2..2..0....0..1..0..0....0..3..0..0....1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 16 2011
STATUS
approved