OFFSET
1,1
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 4's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 1's.
Column 6 of A197307.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions containing all values 0 to 4 for n=4
..2..0..0..0..1..0....0..2..0..0..0..0....0..1..0..0..2..0....0..2..0..0..1..0
..0..2..2..1..4..1....2..3..0..1..0..0....1..4..1..2..3..0....0..3..2..1..4..1
..2..3..0..0..1..0....0..2..1..4..1..2....0..1..0..0..2..2....0..2..0..2..1..0
..0..2..0..0..0..2....2..0..0..1..0..0....0..2..0..0..0..0....0..2..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 13 2011
STATUS
approved