OFFSET
1,1
COMMENTS
Column 4 of A231806
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
EXAMPLE
Some solutions for n=4
..0..0..0..1..0....0..0..0..0..0....0..1..0..0..1....0..0..1..0..0
..1..0..0..0..0....0..0..1..0..1....0..0..0..0..1....0..0..0..0..0
..0..0..0..1..0....0..1..0..0..0....0..1..1..0..0....0..0..0..1..0
..0..0..1..0..0....0..0..0..1..0....0..0..0..0..1....0..0..0..0..1
..1..0..0..0..0....0..1..0..0..1....0..1..1..0..0....0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 13 2013
STATUS
approved