OFFSET
1,1
COMMENTS
Column 3 of A183442.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = a(n-1) + 3*a(n-2) + 8*a(n-3) - a(n-4) - 2*a(n-5) - 2*a(n-6).
Empirical g.f.: x*(3 + 10*x + 7*x^2 - 3*x^3 - 4*x^4 - 2*x^5) / (1 - x - 3*x^2 - 8*x^3 + x^4 + 2*x^5 + 2*x^6). - Colin Barker, Mar 29 2018
EXAMPLE
Some solutions for 5 X 3.
..0..0..0....0..1..0....0..0..1....1..0..0....1..0..0....0..0..0....1..0..0
..0..1..0....0..1..0....0..1..0....1..0..0....1..0..1....0..0..0....1..0..0
..1..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..1..1....0..0..0
..0..0..1....0..0..0....0..0..1....0..0..1....0..0..0....0..0..0....1..0..0
..0..0..1....0..1..1....0..0..1....0..1..0....0..0..0....1..1..0....0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2011
STATUS
approved