OFFSET
1,2
EXAMPLE
Some solutions for n=4
...1.1.3.3...1.1.1.2...1.1.1.3...1.1.2.2...1.1.1.3...1.2.3.3...1.2.3.3
...1.2.2.3...1.1.2.2...1.2.3.3...1.2.2.3...1.1.2.3...2.2.2.3...1.2.3.3
...2.2.2.3...1.2.2.2...1.2.3.3...1.2.3.3...1.2.2.2...2.2.2.3...1.2.3.3
...2.2.2.3...3.3.2.2...2.2.2.3...2.2.3.3...1.2.2.2...2.3.3.3...2.2.2.3
------
...1.1.1.1...1.2.2.2...1.1.1.3...1.1.3.3...1.1.1.2...1.1.2.2...1.1.3.3
...1.1.1.3...1.2.2.3...1.1.2.3...1.1.3.3...1.1.2.2...1.2.2.3...1.2.2.3
...1.1.3.3...2.2.3.3...1.3.3.3...2.2.2.3...1.1.3.2...2.2.3.3...1.2.3.3
...1.3.3.2...2.2.3.3...3.3.3.3...2.3.3.3...1.2.2.2...3.3.3.3...1.2.3.3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 21 2009
STATUS
approved