OFFSET
1,1
COMMENTS
Row 2 of A190071.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
EXAMPLE
Some solutions for n=4
.-1....1....4...-2...-1....1...-3...-4...-2...-1...-1....2...-4...-3....3....1
..3...-1...-4...-4....1....3...-3...-3....3...-3...-1....2...-2....4...-3...-1
..2...-3...-4....4....1....4....3....2....2....4....1...-2....1....4...-4...-2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 04 2011
STATUS
approved