OFFSET
1,2
COMMENTS
Column 1 of A254947
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
All solutions for n=4
..2....2....2....2....2....2....2....2
..2....2....1....1....2....2....1....1
..1....2....2....1....1....2....1....2
..2....2....1....1....1....1....2....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 10 2015
STATUS
approved