OFFSET
1,1
COMMENTS
Column 7 of A280480.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..26
EXAMPLE
Some solutions for n=3
..0..0..0..0..1..1..1. .0..1..1..2..2..2..0. .0..0..0..0..0..1..1
..0..0..0..2..2..1..0. .1..1..2..2..2..0..0. .1..1..1..0..0..1..1
..2..2..2..2..1..1..1. .1..1..2..2..0..0..0. .1..1..1..1..1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2017
STATUS
approved