OFFSET
1,2
COMMENTS
Column 3 of A183450.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1) - a(n-2) + 8*a(n-3) - 7*a(n-4) + 2*a(n-5) - 2*a(n-6).
Empirical g.f.: x*(1 + 7*x + x^2 - 5*x^3 - 2*x^5) / (1 - 2*x + x^2 - 8*x^3 + 7*x^4 - 2*x^5 + 2*x^6). - Colin Barker, Feb 27 2018
EXAMPLE
Some solutions for 5 X 3:
..0..1..0....1..1..0....0..0..0....0..0..0....1..1..0....0..0..0....0..0..1
..0..1..1....1..0..0....0..1..1....0..1..0....0..1..0....0..0..0....0..1..1
..0..0..0....0..0..0....0..0..1....1..0..1....0..0..0....0..0..0....0..0..0
..0..1..0....0..1..1....1..0..0....1..0..1....1..0..0....1..1..0....1..0..0
..1..1..0....0..0..1....1..1..0....0..1..0....1..1..0....1..0..0....1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2011
STATUS
approved