OFFSET
1,1
COMMENTS
Column 4 of A240000
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=4
..0..3..3..0....0..0..3..3....0..3..3..0....0..0..3..3....0..0..0..3
..0..2..2..3....3..3..2..2....0..0..2..1....3..3..2..2....3..3..0..0
..0..2..0..0....3..2..1..0....3..3..0..1....0..2..2..2....3..2..3..2
..3..3..2..0....3..1..3..2....3..3..1..3....3..2..3..3....2..1..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2014
STATUS
approved