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 0's, every 3 is next to 3 1's, every 4 is next to 4 4's
Column 5 of A196590
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
Some solutions for n=4
..0..0..2..1..1....2..0..1..0..0....0..0..1..0..0....1..2..0..2..1
..0..0..0..0..2....0..0..2..0..0....0..0..2..2..2....1..0..0..0..0
..2..1..0..0..0....0..0..1..1..2....0..1..0..0..0....2..0..0..2..1
..0..0..2..1..0....0..0..0..0..0....0..2..0..0..0....0..0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 04 2011
STATUS
approved