OFFSET
1,3
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 3's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 0's
Diagonal of A197503
EXAMPLE
Some solutions for n=4
..0..0..0..0....1..2..2..1....1..1..3..1....0..1..3..1....0..1..0..0
..0..1..0..0....3..1..1..3....3..1..1..2....0..1..1..0....1..3..1..0
..0..3..1..0....1..1..0..1....1..0..1..2....1..3..0..0....0..0..1..0
..0..1..0..0....1..3..1..0....0..1..3..1....2..1..0..0....0..1..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 15 2011
STATUS
approved