OFFSET
1,2
COMMENTS
Diagonal of A275142.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..19
EXAMPLE
Some solutions for n=5
..0..1..2..0..1. .0..1..2..1..0. .0..1..2..1..0. .0..1..2..1..0
..2..0..1..2..1. .2..0..1..0..1. .2..0..1..2..0. .2..0..1..2..1
..1..2..1..2..0. .1..0..1..2..0. .1..2..1..2..0. .1..2..1..2..0
..0..2..0..1..0. .1..2..0..2..0. .1..2..0..1..0. .0..2..0..1..0
..2..1..2..1..2. .1..0..2..1..2. .0..1..2..1..2. .2..0..2..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 17 2016
STATUS
approved