OFFSET
1,2
COMMENTS
Row 4 of A280902.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..87
EXAMPLE
Some solutions for n=3
..0..1..1. .0..1..2. .0..1..0. .0..1..0. .0..1..2. .0..1..1. .0..0..1
..1..2..2. .2..2..2. .2..2..0. .0..0..2. .1..0..0. .0..1..2. .0..2..1
..0..0..2. .0..1..1. .0..0..2. .0..0..2. .1..1..1. .0..0..0. .0..2..2
..0..1..0. .1..2..2. .2..2..0. .1..0..2. .2..1..0. .2..2..0. .1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2017
STATUS
approved