OFFSET
1,2
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 2's
Diagonal of A197235
EXAMPLE
Some solutions for n=4
..0..0..0..0....2..0..0..2....2..0..1..0....0..1..2..0....0..0..0..1
..2..0..0..1....0..0..1..0....0..0..3..1....1..3..0..0....0..0..1..3
..2..0..1..3....2..1..3..1....0..0..1..0....0..1..0..0....0..0..2..1
..0..0..0..1....0..0..0..0....2..0..0..0....2..0..0..0....0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 12 2011
STATUS
approved