OFFSET
1,1
COMMENTS
Column 1 of A184614.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 3*a(n-1) + 6*a(n-3) + 4*a(n-4).
Empirical g.f.: 2*x*(4 + 2*x + 7*x^2 + 4*x^3) / ((1 + 2*x^2)*(1 - 3*x - 2*x^2)). - Colin Barker, Apr 14 2018
EXAMPLE
Some solutions for 3 X 2:
..1..1....0..0....1..1....1..0....1..1....1..1....0..1....0..1....0..0....0..1
..0..0....0..1....0..1....0..0....1..0....0..0....0..0....1..1....1..1....1..0
..1..0....1..0....1..0....0..1....1..1....0..1....0..1....1..1....0..1....1..1
...
...2.......1.......3.......1.......3.......2.......1.......3.......2.......2...
...1.......2.......2.......1.......3.......1.......1.......4.......3.......3...
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2011
STATUS
approved