OFFSET
1,3
COMMENTS
Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 4's, every 3 is next to 3 0's, every 4 is next to 4 2's
Diagonal of A196646
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..3..0....0..0..0..0....0..0..0..0....0..0..3..0
..0..3..0..3....0..0..0..0....3..0..3..0....0..0..0..0....3..0..0..0
..0..3..0..0....3..0..0..3....0..0..3..0....0..3..3..0....0..3..3..0
..0..0..3..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 04 2011
STATUS
approved