OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 17*a(n-2) -96*a(n-4) +210*a(n-6) -152*a(n-8).
EXAMPLE
Some solutions for n=5:
..1..2..1....2..1..1....2..1..2....2..1..1....1..2..1....1..2..1....2..1..1
..2..1..2....1..0..2....1..2..1....1..2..2....2..0..0....2..0..0....1..2..2
..1..2..1....2..0..1....1..2..2....1..2..2....2..0..0....1..0..2....2..1..1
..2..0..0....1..0..2....2..0..1....2..1..1....1..0..2....2..0..1....1..0..2
..2..1..2....1..2..1....2..1..2....1..2..1....2..0..1....2..1..2....1..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 03 2014
STATUS
approved