OFFSET
1,2
COMMENTS
Column 2 of A188236
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..31
EXAMPLE
Some solutions for n=4
.-3...-2...-3...-2...-3...-4...-4...-4...-3...-4...-1...-2...-4...-3...-3...-1
.-2...-2...-3....0...-1...-2...-4....0....0...-3....0...-1....0...-3...-1...-1
..2....0....2....0....2....2....4....0....1....3....0...-1....2....3....0....0
..3....4....4....2....2....4....4....4....2....4....1....4....2....3....4....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 24 2011
STATUS
approved