OFFSET
1,1
COMMENTS
Diagonal of A268628.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..14
EXAMPLE
Some solutions for n=4
..2..1..2..2. .0..0..0..0. .0..0..1..0. .2..1..0..0. .1..1..0..0
..1..0..1..2. .0..1..1..0. .0..0..0..1. .1..0..0..0. .2..2..1..0
..2..1..2..1. .1..0..0..1. .1..0..1..2. .0..1..0..0. .2..2..2..1
..2..2..2..0. .0..0..1..0. .0..1..2..2. .0..0..0..1. .2..2..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2016
STATUS
approved