OFFSET
1,4
COMMENTS
Column 1 of A222360
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
All solutions for n=4
..0....0....0....0
..0....0....0....1
..0....0....1....1
..1....0....1....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 16 2013
STATUS
approved