OFFSET
1,1
COMMENTS
Column 7 of A221438
EXAMPLE
Some solutions for n=2
..1..2..3..4..5..6..7....1..3..5..2..6..4..7....1..2..3..4..7..6..5
..2..7..1..3..6..4..5....2..5..6..4..3..7..1....2..4..6..1..5..3..7
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 16 2013
STATUS
approved