OFFSET
1,3
COMMENTS
Column 4 of A195522
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..3-3......4-4......3-3.....-3.3.....-3.3.....-1.1.....-2.2......1-1
.-3.4-1....0.0.0...-3.0.3....2-1-1....2-3.1....0-4.4...-2.1.1....1.0-1
..0-1.1.0.-4.4.0.0..0.3-3.0..1-2.1.0..1.0-1.0..1.3-4.0..4-3-1.0.-2.1.1.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 20 2011
STATUS
approved