OFFSET
1,2
COMMENTS
Diagonal of A189951
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..18
EXAMPLE
Some solutions with n=3
.-2...-3...-2...-2....3....3...-2....1...-1....2...-3...-2...-3...-1....1....3
.-1....1...-1....1...-2...-2....2...-2....2....1....3....2....1....1....1....2
..1...-3....3...-1...-1....3....2...-1...-3...-3...-3...-2....1....1...-1...-1
.-1....2...-2....1...-3....2...-2...-2...-2...-2....1...-2...-1...-1...-1....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin May 02 2011
STATUS
approved