OFFSET

1,2

COMMENTS

Diagonal of A221255

EXAMPLE

Some solutions for n=3

..0..2..0....1..2..0....0..2..0....1..2..0....0..2..1....1..2..1....0..2..1

..2..2..0....1..2..0....1..2..0....0..2..1....1..2..0....0..2..0....1..2..1

..1..2..0....1..2..0....2..2..0....1..2..0....1..2..0....0..2..1....0..2..0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2013

STATUS

approved