OFFSET
1,2
COMMENTS
Row 4 of A221632
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..20
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..1....0..1..0....1..0..1....1..0..1....0..1..0....1..1..0
..0..1..0....1..1..1....1..0..0....0..1..0....1..1..0....1..1..1....0..0..0
..1..1..0....0..0..1....1..0..1....1..1..1....0..1..1....1..0..1....1..0..1
..0..0..1....0..1..1....1..1..1....1..0..1....0..1..1....1..1..1....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 21 2013
STATUS
approved