OFFSET
1,1
COMMENTS
Column 2 of A184231.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6*a(n-1) + 7*a(n-2) - 42*a(n-3) + 17*a(n-4) + 24*a(n-5) - 12*a(n-6).
Empirical g.f.: x*(57 + 69*x - 547*x^2 + 250*x^3 + 324*x^4 - 168*x^5) / (1 - 6*x - 7*x^2 + 42*x^3 - 17*x^4 - 24*x^5 + 12*x^6). - Colin Barker, Apr 12 2018
EXAMPLE
Some solutions for 5 X 3:
..0..1..0....3..0..3....0..3..0....2..0..3....2..3..0....3..0..2....2..0..3
..3..0..3....1..3..0....2..0..3....0..3..0....3..0..2....0..3..1....0..3..2
..2..3..1....3..1..3....1..3..0....3..0..2....1..3..1....3..0..3....1..0..3
..3..0..2....0..3..0....2..0..2....0..3..0....3..0..2....1..3..1....0..3..1
..1..3..1....3..1..3....1..3..1....2..0..1....0..2..0....2..0..3....2..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2011
STATUS
approved