OFFSET
1,2
COMMENTS
Diagonal of A269829.
EXAMPLE
Some solutions for n=3
..2..3..2. .3..4..4. .3..2..0. .4..4..3. .0..2..1. .0..4..2. .3..2..0
..1..4..3. .2..4..2. .3..0..0. .3..2..4. .3..3..0. .3..3..4. .1..0..1
..1..2..3. .4..3..2. .4..2..3. .1..4..1. .0..3..3. .2..4..4. .0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 2016
STATUS
approved