OFFSET
1,2
COMMENTS
Every 0 is next to 0 0's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 3's, every 4 is next to 4 4's
Column 5 of A196138
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
Some solutions for n=4
..0..1..2..0..1....1..0..2..1..1....2..1..0..2..1....2..1..1..2..1
..1..0..1..1..2....2..1..1..1..2....1..0..1..1..0....1..1..1..2..0
..2..1..1..1..0....2..1..1..1..2....1..1..2..0..1....1..2..0..1..1
..0..1..2..2..1....1..1..2..0..1....2..1..0..1..2....1..2..1..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 28 2011
STATUS
approved