OFFSET
1,3
COMMENTS
Column 1 of A183944
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
All solutions for n=4
..1....0....0...-1...-1....1....0
..0....0....1....0....0....0...-1
.-1....0....0....0....1....0....0
..0....0...-1....1....0...-1....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 08 2011
STATUS
approved