OFFSET
1,1
COMMENTS
Every 0 is next to 0 3's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 4's, every 4 is next to 4 0's
Column 7 of A197167
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..166
EXAMPLE
Some solutions for n=4
..0..0..0..1..2..0..0....0..0..0..1..0..0..0....0..0..0..0..1..2..1
..0..0..0..0..1..1..2....0..0..1..2..0..1..0....0..0..0..0..1..2..0
..1..0..2..1..1..0..1....0..4..0..0..1..2..0....1..0..2..1..0..1..0
..2..1..1..1..2..0..0....0..0..1..2..1..0..0....2..1..1..1..2..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 10 2011
STATUS
approved