OFFSET
1,1
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..50
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..2....1..1..1..1
..2..2..2..3....2..2..2..2....2..2..2..2....2..1..2..2....2..2..2..2
..0..0..0..0....0..0..0..0....3..3..0..0....0..0..3..4....0..0..3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
EXTENSIONS
Terms a(6) and beyond from Andrew Howroyd, Jul 01 2017
STATUS
approved