OFFSET
1,2
COMMENTS
Diagonal of A220621
EXAMPLE
Some solutions for n=3 0=self 1=nw 3=ne 4=w 6=e 7=sw 9=se (reciprocal directions total 10)
..0..9..7....0..6..4....0..0..0....6..4..0....0..0..0....9..0..0....0..9..0
..9..3..1....0..7..7....0..0..0....0..6..4....0..9..0....0..1..0....0..7..1
..0..1..0....3..3..0....0..0..0....0..0..0....6..4..1....0..6..4....3..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 17 2012
STATUS
approved