OFFSET
1,4
COMMENTS
Column 1 of A208993.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..35
EXAMPLE
All solutions for n=7:
..0...-1...-1...-1...-1...-1...-1...-1...-1
..0...-1...-1...-1....0....0....0....0....0
..0....0....0....0....0....0....0....1...-1
..0....1....1....0....0....0....1....0....0
..0....1....0....1....1....0....0....0....1
..0....0....1....1....0....1....0....0....1
..0....0....0....0....0....0....0....0....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 04 2012
STATUS
approved