OFFSET
1,3
COMMENTS
Every 0 is next to 0 1's, every 1 is next to 1 4's, every 2 is next to 2 3's, every 3 is next to 3 2's, every 4 is next to 4 0's
Column 7 of A196929
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..4..0....0..4..0..0..4..0..0....0..0..0..4..0..4..0
..0..4..0..0..4..0..0....0..0..4..0..0..0..0....0..0..0..0..4..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 07 2011
STATUS
approved