OFFSET
1,1
COMMENTS
Column 1 of A210276.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8*a(n-1) - 12*a(n-3).
Empirical g.f.: x*(35 - 7*x - 54*x^2) / (1 - 8*x + 12*x^3). - Colin Barker, Jul 15 2018
EXAMPLE
Some solutions for n=4:
..1..1....2..1....2..1....2..1....2..0....2..0....0..2....2..2....1..2....1..1
..0..0....0..0....1..1....2..2....2..2....1..0....2..0....1..2....1..1....2..0
..2..0....1..2....0..1....1..2....0..1....0..0....0..2....2..2....1..2....0..2
..0..2....2..1....2..2....0..2....2..1....1..0....0..1....1..2....1..0....2..2
..0..0....1..0....1..2....2..2....2..1....2..1....1..2....1..1....1..2....2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2012
STATUS
approved