OFFSET
1,2
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 4's, every 4 is next to 4 1's.
Diagonal of A196210.
EXAMPLE
Some solutions for n=4
..0..0..1..1....1..0..0..0....1..1..0..0....0..0..0..1....0..1..1..0
..1..1..1..0....1..0..0..0....0..1..1..1....0..0..0..1....0..1..4..1
..1..4..1..0....1..0..0..0....1..1..1..1....0..0..0..1....1..1..1..1
..0..1..1..0....1..0..0..0....1..0..0..0....0..0..0..1....1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 29 2011
STATUS
approved