OFFSET
1,2
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 0's, every 2 is next to 2 2's, every 3 is next to 3 4's, every 4 is next to 4 1's
Diagonal of A196456
EXAMPLE
Some solutions for n=4
..1..0..0..1....1..0..0..0....1..0..0..1....1..0..0..1....1..0..0..1
..1..2..2..2....1..2..2..0....2..2..0..1....1..2..2..1....1..2..2..2
..0..2..0..2....0..2..2..0....2..2..0..1....0..2..2..0....0..2..0..2
..1..2..2..2....0..1..1..0....0..0..0..1....0..0..1..1....0..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 02 2011
STATUS
approved