OFFSET
1,2
COMMENTS
Column 4 of A278272.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=3
..0..1..0..1. .0..2..3..1. .0..1..1..3. .0..0..2..3. .0..0..0..1
..0..2..2..0. .1..0..3..2. .3..2..2..0. .1..1..0..2. .1..2..0..2
..1..3..1..0. .3..0..1..2. .0..1..3..1. .2..3..2..3. .0..3..1..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 16 2016
STATUS
approved