OFFSET
1,4
COMMENTS
Column 1 of A222402
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
All solutions for n=4
..0....0....0
..1....0....0
..1....1....0
..1....1....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 18 2013
STATUS
approved