OFFSET
1,2
COMMENTS
Column 1 of A185750.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) - a(n-2) - 2*a(n-3) + 8*a(n-4).
Empirical g.f.: 8*x^2*(3 - 4*x + 6*x^2) / (1 - 3*x + x^2 + 2*x^3 - 8*x^4). - Colin Barker, Feb 28 2018
EXAMPLE
Some solutions for 3 X 2:
..0..1....1..0....1..1....1..0....0..1....1..0....0..0....1..1....0..1....1..0
..0..1....1..0....0..0....1..0....0..0....1..1....0..1....1..0....1..1....0..0
..0..1....1..0....1..1....0..0....0..0....0..1....0..1....0..0....1..0....0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 01 2011
STATUS
approved