OFFSET
1,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..100
EXAMPLE
Some solutions for n=6:
.-2...-1...-2...-1...-2...-2...-2...-2...-1...-2...-2...-1...-1...-1...-2...-1
..0....1....1....0....1....0...-1....1....0....0....0...-1....0....0...-1...-1
..1...-1....0...-1...-1....0....1...-1...-1....0....1....0....0...-1....0....0
..0....1....0....0....0....1....2...-1....0....1...-1....1....1....1....2...-1
..1...-1...-1....0....1....1....0....1....2....0....0....0...-1...-1....0....2
..0....1....2....2....1....0....0....2....0....1....2....1....1....2....1....1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
EXTENSIONS
a(20)-a(25) from Andrew Howroyd, Mar 02 2017
STATUS
approved