OFFSET
1,1
COMMENTS
Column 2 of A208445.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) + 10*a(n-2) - 7*a(n-3) + 8*a(n-4) - 8*a(n-5).
Empirical g.f.: 2*x*(1 - x)*(3 + 8*x + 3*x^2 + 6*x^3) / (1 - 3*x - 10*x^2 + 7*x^3 - 8*x^4 + 8*x^5). - Colin Barker, Jul 03 2018
EXAMPLE
Some solutions for n=4:
..2..0....0..2....0..2....0..2....2..0....0..1....0..2....2..0....1..0....2..0
..0..1....2..0....1..0....1..1....0..2....2..1....1..2....1..2....2..2....1..2
..2..1....0..1....0..1....2..0....1..0....0..0....2..0....0..2....0..0....0..2
..0..2....2..1....2..0....0..1....2..2....1..1....0..2....1..0....2..0....2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 26 2012
STATUS
approved