OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) + 8*a(n-2) + 4*a(n-3).
Empirical g.f.: 2*x^2*(3 + 2*x) / (1 - 5*x - 8*x^2 - 4*x^3). - Colin Barker, Sep 21 2018
EXAMPLE
Some solutions for n=3.
..0..2....0..1....0..1....0..2....0..0....0..1....0..0....0..0....0..2....0..1
..1..0....2..0....2..1....1..2....1..2....1..2....1..0....1..0....1..0....0..2
..0..2....1..2....2..0....0..1....0..2....0..2....2..2....2..1....2..2....1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 16 2013
STATUS
approved