OFFSET
1,1
COMMENTS
Column 1 of A183792.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) + 24*a(n-2) + 24*a(n-3).
Empirical g.f.: x*(31 + 123*x + 108*x^2) / (1 - 3*x - 24*x^2 - 24*x^3). - Colin Barker, Apr 04 2018
EXAMPLE
Some solutions for 3 X 2:
..1..0....0..1....2..1....0..0....1..0....1..2....1..2....1..2....2..1....0..1
..1..1....0..2....2..2....2..1....2..2....0..2....2..0....2..2....0..2....2..0
..0..1....2..1....1..1....1..2....2..2....0..0....2..2....1..2....1..2....0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2011
STATUS
approved