OFFSET
1,4
COMMENTS
Diagonal of A298957.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0
..0..0..0..0..0. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0
..0..0..0..0..0. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0
..1..1..1..1..1. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0
..1..1..1..1..1. .0..0..1..1..1. .0..0..0..1..1. .0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 30 2018
STATUS
approved