OFFSET
1,1
COMMENTS
Column 4 of A273964.
EXAMPLE
Some solutions for n=3
..0..1..2..3. .0..1..0..1. .0..1..2..3. .0..1..1..0. .0..1..1..2
..3..0..3..2. .2..1..2..2. .3..0..2..1. .0..2..2..0. .2..2..0..3
..3..0..1..2. .2..3..1..0. .3..1..2..0. .0..3..1..0. .1..3..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 05 2016
STATUS
approved