OFFSET
1,1
COMMENTS
Diagonal of A252075
EXAMPLE
Some solutions for n=4
..2..2..2..2..2..2....2..2..1..2..2..2....2..2..2..1..2..2....1..2..2..2..2..1
..1..2..2..2..2..2....1..2..2..2..1..2....2..2..2..2..2..2....2..2..2..2..2..2
..2..2..2..1..2..2....2..2..2..2..2..2....2..2..2..2..2..2....2..1..2..2..2..2
..2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..1..2
..2..2..2..2..2..2....1..2..2..2..2..1....2..2..2..1..2..2....2..2..2..2..2..2
..2..2..2..2..2..2....2..2..2..2..1..2....2..2..2..2..2..2....1..2..2..2..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 13 2014
STATUS
approved