OFFSET
1,1
COMMENTS
Column 2 of A184003.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6*a(n-1) - 60*a(n-3) + 85*a(n-4) + 150*a(n-5) - 360*a(n-6) + 396*a(n-8) - 216*a(n-9).
Empirical g.f.: 3*x*(57 - 239*x - 425*x^2 + 2673*x^3 - 234*x^4 - 8968*x^5 + 5676*x^6 + 9252*x^7 - 7992*x^8) / ((1 - x)*(1 - 2*x)*(1 - 3*x)*(1 - 2*x^2)*(1 - 3*x^2)*(1 - 6*x^2)). - Colin Barker, Apr 09 2018
EXAMPLE
Some solutions for 4 X 3:
..1..2..1....0..2..0....2..0..2....0..2..0....1..2..2....0..2..1....2..0..1
..0..1..0....1..0..1....2..1..2....0..2..0....1..2..0....1..2..0....1..2..2
..1..2..1....1..1..1....1..1..1....0..2..0....1..2..2....1..1..2....2..0..1
..1..0..1....1..0..1....1..2..1....0..2..0....1..2..0....2..1..1....1..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2011
STATUS
approved