OFFSET
1,2
COMMENTS
Diagonal of A283572.
EXAMPLE
Some solutions for n=4
..1..1..1..0. .0..1..0..1. .1..0..0..0. .0..1..0..0. .1..0..1..0
..1..0..0..0. .0..1..0..1. .0..0..0..0. .1..0..1..0. .1..0..1..0
..1..0..1..1. .0..0..1..0. .0..1..0..0. .1..0..1..0. .1..0..1..0
..0..0..0..0. .0..1..0..0. .1..1..0..0. .0..0..1..0. .0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2017
STATUS
approved