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 4's, every 3 is next to 3 1's, every 4 is next to 4 0's
Diagonal of A196989
EXAMPLE
Some solutions for n=4
..1..3..1..0....1..3..1..1....1..0..0..1....0..1..3..1....0..0..0..0
..0..1..0..0....0..1..1..3....3..1..1..3....0..0..1..0....0..4..0..0
..0..0..0..0....0..0..0..1....1..0..0..1....1..3..1..0....0..0..4..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..0....0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 08 2011
STATUS
approved