OFFSET
1,2
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 3's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 4's.
Column 7 of A196746.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
Some solutions for n=4
..0..0..0..0..1..0..0....0..0..0..0..0..0..0....0..0..3..0..3..0..0
..0..0..3..0..3..0..0....0..3..0..0..3..1..0....0..0..0..0..0..1..0
..3..0..3..0..0..0..0....0..1..1..3..0..0..3....0..0..3..3..0..3..0
..0..0..0..0..3..0..0....0..0..0..0..0..0..0....0..3..0..0..3..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 06 2011
STATUS
approved