OFFSET
1,1
COMMENTS
Column 3 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*(361 - 1587*x - 2497*x^2 + 17685*x^3 - 3474*x^4 - 59088*x^5 + 42012*x^6 + 60804*x^7 - 56376*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 4:
..2..0..2..0....0..2..2..2....0..1..1..2....1..1..2..0....2..1..2..1
..2..2..2..2....2..1..0..1....1..2..0..1....2..0..1..1....1..2..1..2
..0..2..0..2....0..2..2..2....0..1..1..2....0..2..1..1....2..1..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2011
STATUS
approved