OFFSET
1,2
COMMENTS
Column 4 of A221890
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..23
EXAMPLE
Some solutions for n=4
..0..1..1..0....0..3..2..1....0..3..2..1....0..1..1..1....1..3..1..1
..1..3..2..0....0..1..2..0....0..1..1..0....0..2..2..0....0..0..3..0
..0..1..2..1....0..1..0..0....0..1..2..0....1..2..1..0....1..2..0..0
..1..2..1..0....1..2..3..0....1..2..2..0....0..1..3..1....0..2..2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 30 2013
STATUS
approved