OFFSET
1,3
COMMENTS
Column 1 of A208814.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..31
EXAMPLE
Some solutions for n=6:
.-1...-1...-1...-1...-1...-1...-1....0...-1...-1...-1...-1...-1...-1...-1...-1
..0....0...-1....0....0....1....0....0...-1....0...-1....1....0....1....0...-1
..0...-1....0....1....0...-1....0....0....0....0....0....0...-1....0...-1....1
..1....1....1...-1....1....1...-1....0....1....0....0...-1....0....0....1....1
..0....1....1....1...-1....0....1....0....0....0....1....1....1....0....0....0
..0....0....0....0....1....0....1....0....1....1....1....0....1....0....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved