OFFSET
1,4
COMMENTS
Diagonal of A298187.
EXAMPLE
Some solutions for n=7
..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0
..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0
..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0
..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0
..0..0..0..1..1..1..1. .0..0..0..0..0..0..0. .0..0..0..1..1..0..0
..0..0..0..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..1..1..0..0
..0..0..0..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 14 2018
STATUS
approved