OFFSET
1,1
COMMENTS
Column 2 of A184039.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) - 6*a(n-3) + 4*a(n-4).
Conjectures from Colin Barker, Apr 10 2018: (Start)
G.f.: x*(28 - 44*x - 59*x^2 + 88*x^3) / ((1 - x)*(1 - 2*x)*(1 - 2*x^2)).
a(n) = 9*2^(n/2-1) + 9*2^(n-1) + 13 for n even.
a(n) = 9*2^(n-1) + 3*2^((n+1)/2) + 13 for n odd.
(End)
EXAMPLE
Some solutions for 5 X 3:
..1..2..1....0..1..0....0..1..0....1..3..1....2..1..2....3..2..3....3..2..3
..0..1..0....2..3..2....1..0..1....1..0..1....3..0..3....0..3..0....2..3..2
..2..1..2....0..1..0....0..1..0....3..1..3....2..1..2....3..2..3....2..3..2
..0..1..0....3..2..3....0..1..0....0..1..0....3..0..3....3..0..3....2..3..2
..2..1..2....1..0..1....0..1..0....1..3..1....1..2..1....2..3..2....2..3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2011
STATUS
approved