OFFSET
1,4
COMMENTS
Diagonal of A298167.
EXAMPLE
Some solutions for n=7
..0..0..0..0..0..1..1. .0..0..0..1..1..1..1. .0..0..0..0..0..1..1
..0..0..1..0..0..1..1. .0..0..0..1..1..1..1. .0..0..1..0..0..1..1
..0..1..1..1..0..1..1. .0..0..0..1..1..1..1. .0..1..1..1..0..1..1
..0..0..1..1..1..0..0. .1..1..1..0..0..0..0. .0..0..1..1..0..1..1
..0..0..0..0..1..0..0. .1..1..1..0..0..0..0. .0..0..1..0..0..0..1
..1..1..1..0..0..1..1. .0..0..0..1..1..1..1. .0..0..1..1..0..1..1
..1..1..1..0..0..1..1. .0..0..0..1..1..1..1. .0..0..1..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2018
STATUS
approved