OFFSET
1,1
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 1's, every 4 is next to 4 4's
Column 7 of A196287
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..180
EXAMPLE
Some solutions for n=4
..1..3..1..0..1..1..0....0..0..1..1..3..1..0....1..3..1..0..0..0..0
..0..1..1..0..1..3..1....1..1..1..0..1..1..0....0..1..3..1..1..1..1
..1..3..1..3..1..0..1....1..1..1..0..3..1..1....1..1..2..3..1..1..3
..1..0..0..1..1..0..1....0..0..1..1..1..0..1....1..0..1..1..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 30 2011
STATUS
approved