OFFSET
1,1
COMMENTS
Column 1 of A184497.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) + 11*a(n-2) - 4*a(n-3) - 12*a(n-4).
Empirical g.f.: x*(31 + 72*x - 44*x^2 - 96*x^3) / ((1 + 2*x)*(1 - 5*x - x^2 + 6*x^3)). - Colin Barker, Apr 12 2018
EXAMPLE
Some solutions for 3 X 2:
..2..0....1..2....2..1....2..1....2..1....1..0....2..2....1..2....1..2....2..2
..2..1....1..1....2..2....2..2....1..1....2..2....2..2....2..2....2..2....1..2
..2..1....2..1....0..2....1..0....1..2....2..1....1..0....1..2....2..0....2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 15 2011
STATUS
approved