OFFSET
1,2
COMMENTS
Diagonal of A299561.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..0
..0..0..0..0..0. .0..1..1..1..0. .0..0..0..1..1. .0..0..0..0..0
..0..0..0..0..0. .0..1..1..1..0. .0..0..0..1..1. .0..0..0..0..0
..1..1..1..1..1. .0..1..1..1..0. .0..0..0..1..1. .0..0..0..0..0
..1..1..1..1..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2018
STATUS
approved