OFFSET
1,2
EXAMPLE
Some solutions for n=6:
.-4...-6...-4...-3...-3...-2...-5...-4...-5...-3...-3...-5...-4...-6...-3...-4
..0...-2...-2...-1...-2....0...-1....0...-3...-1...-2...-5...-3....0...-2....0
.-2....3....3....1....3....1....2...-1....2...-1....4....0....0....0...-1....2
..4....3....4....3...-1...-2....3....5....0....1...-1....6....3....0....0....3
..0....4...-1....0....1....1....2....0....5....4....2....3....4....6....4...-2
..2...-2....0....0....2....2...-1....0....1....0....0....1....0....0....2....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 04 2012
EXTENSIONS
a(12)-a(20) from Andrew Howroyd, Mar 19 2017
STATUS
approved