OFFSET
1,1
COMMENTS
Row 4 of A189951
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
Some solutions with n=3
..1....1....2....1....1...-2....3....2....1....1....3....3....3...-3....2....3
.-2....2....1...-3....3....1...-3...-2...-3....1...-2....1....1...-3....2...-3
.-1...-1...-3...-1...-2....3....1...-2...-2...-3...-1...-2....1....3....2....1
.-2....3...-3...-2....3...-1...-1....1....1...-1...-3...-1...-1....3...-2...-3
.-2....1....2....2....1...-3....1....1...-1...-3....3...-3...-1...-3....2...-2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin May 02 2011
STATUS
approved