OFFSET
1,1
COMMENTS
Column 3 of A183335.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1) + a(n-2) + 3*a(n-3) + a(n-5) + 3*a(n-6) - a(n-7) - 3*a(n-8) - a(n-9).
Empirical g.f.: 2*x*(1 + 3*x + 2*x^2 - x^3 + 3*x^4 - 4*x^6 - 2*x^7) / (1 - 2*x - x^2 - 3*x^3 - x^5 - 3*x^6 + x^7 + 3*x^8 + x^9). - Colin Barker, Mar 27 2018
EXAMPLE
Some solutions for 4 X 3:
..0..0..0....0..1..0....0..0..0....1..0..1....0..0..0....0..0..0....0..1..0
..1..0..0....0..1..1....0..0..0....0..0..0....1..0..0....0..0..0....0..1..1
..1..0..0....0..0..0....1..1..1....0..1..1....1..0..0....1..1..0....0..0..0
..0..0..1....0..0..0....0..0..0....0..1..0....0..0..0....0..1..0....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2011
STATUS
approved