OFFSET
1,3
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..12
EXAMPLE
Some solutions for 4X4
..0..1..3..2....0..1..2..3....0..1..0..4....0..1..2..4....0..1..2..0
..1..2..0..1....1..0..3..2....1..2..3..0....1..2..0..1....1..0..1..2
..3..0..4..0....2..3..2..3....0..3..2..1....2..0..3..4....2..1..3..4
..2..1..0..2....3..2..3..4....4..0..1..3....4..1..4..0....0..2..4..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 22 2011
STATUS
approved