OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) +6*a(n-3) -a(n-4) -a(n-6)
EXAMPLE
Some solutions for n=5
..0..1....1..1....0..0....1..0....0..0....0..1....0..0....0..1....1..0....1..1
..0..1....0..0....1..1....1..0....1..1....0..1....1..1....0..1....1..0....0..0
..2..1....1..2....1..2....0..2....2..0....1..2....2..2....0..1....0..0....2..1
..0..0....1..0....0..0....0..1....1..0....1..0....0..0....0..0....0..1....0..1
..1..1....1..0....1..1....0..1....1..0....1..0....1..1....1..1....0..1....0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 02 2012
STATUS
approved