OFFSET
1,2
COMMENTS
Diagonal of A274858.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..17
EXAMPLE
Some solutions for n=4
..0..1..2..1. .0..1..2..0. .0..1..2..1. .0..1..0..2. .0..1..0..1
..2..0..1..2. .1..2..0..1. .1..0..1..2. .1..0..2..0. .2..0..1..2
..0..1..2..0. .2..0..1..0. .0..1..2..0. .0..2..1..2. .0..1..2..0
..2..0..1..2. .0..2..0..1. .1..2..0..1. .1..0..2..1. .1..2..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 09 2016
STATUS
approved