OFFSET
0,2
EXAMPLE
Some solutions for n=3:
..0..1..0....0..0..0....1..1..0....0..0..1....0..0..0....1..1..1....0..0..0
..0..1..1....1..0..0....1..1..0....0..0..1....0..1..0....1..1..1....0..1..0
..1..1..1....1..1..1....1..1..1....0..1..1....0..1..0....1..1..1....0..1..1
CROSSREFS
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Mar 27 2013
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Feb 14 2024
STATUS
approved