OFFSET
1,3
COMMENTS
Every 0 is next to 0 0's, every 1 is next to 1 1's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's
Diagonal of A197317
EXAMPLE
Some solutions for n=4
..0..1..1..0....0..1..1..0....0..1..1..2....2..1..1..2....2..1..1..2
..1..2..2..1....1..2..0..1....1..2..0..1....1..2..2..1....1..2..2..1
..1..2..2..1....1..0..2..1....1..2..2..1....1..0..2..1....1..2..0..1
..2..1..1..2....2..1..1..0....0..1..1..2....2..1..1..2....0..1..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 13 2011
STATUS
approved