OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..12
EXAMPLE
Some solutions for 4X4
..0..1..0..2....0..1..0..1....0..1..0..2....0..1..3..1....0..1..3..4
..1..2..3..1....1..2..1..0....1..2..1..3....1..2..4..3....1..2..1..0
..0..3..1..0....0..1..2..1....0..1..2..4....3..4..1..4....3..1..4..3
..2..1..0..1....1..0..1..3....2..3..4..3....1..3..4..1....4..0..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 20 2011
STATUS
approved