OFFSET
1,2
COMMENTS
Column 4 of A221314
FORMULA
Empirical: a(n) = 2*a(n-1) + 2*a(n-2) - a(n-3) - 2*a(n-4) - a(n-5). - Vaclav Kotesovec, May 23 2013
EXAMPLE
Some solutions for n=3
..2..2..0..0....2..2..2..0....2..2..0..0....0..2..2..0....0..2..2..0
..0..2..0..2....2..0..0..0....2..0..0..2....2..2..0..0....0..0..0..0
..0..2..0..2....0..0..2..2....0..0..2..2....0..0..2..2....2..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 10 2013
STATUS
approved