OFFSET
1,1
COMMENTS
Column 1 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.: x*(81 - 315*x - 665*x^2 + 3549*x^3 + 270*x^4 - 12000*x^5 + 6300*x^6 + 12420*x^7 - 9720*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 3 X 2:
..0..1....1..1....0..1....2..1....0..1....0..2....2..1....2..1....2..0....2..0
..0..0....0..1....1..1....1..2....2..0....0..2....2..1....2..1....0..2....0..1
..1..0....2..0....1..0....2..1....1..0....0..2....2..1....1..2....2..0....2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2011
STATUS
approved