OFFSET
1,2
COMMENTS
Diagonal of A278280.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..12
EXAMPLE
Some solutions for n=4
..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..0. .0..1..0..1
..0..1..1..0. .0..1..0..1. .0..1..1..0. .0..1..0..1. .0..1..0..1
..1..1..1..0. .0..1..0..1. .0..1..1..0. .0..0..0..1. .1..0..0..0
..1..0..0..1. .0..1..1..1. .1..0..1..1. .0..1..1..0. .0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 16 2016
STATUS
approved