OFFSET
1,2
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 4's
Diagonal of A196856
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..1..1....0..0..0..2....0..1..1..0....0..0..0..0
..2..0..0..2....0..0..0..0....2..0..0..0....0..0..0..0....0..0..1..1
..1..1..0..1....2..2..2..1....2..0..2..2....2..1..2..1....1..1..2..0
..0..0..0..1....0..0..0..1....0..1..1..0....0..1..0..1....0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 06 2011
STATUS
approved