OFFSET
1,1
COMMENTS
Column 1 of A185769.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = a(n-1) + 4*a(n-2).
Conjectures from Colin Barker, Feb 22 2018: (Start)
G.f.: 8*x*(2 + 3*x) / (1 - x - 4*x^2).
a(n) = (2^(-n)*((1-sqrt(17))^n*(-13+3*sqrt(17)) + (1+sqrt(17))^n*(13+3*sqrt(17)))) / sqrt(17).
(End)
EXAMPLE
Some solutions for 3 X 2:
..0..1....0..0....1..1....0..0....1..1....1..1....1..0....0..0....0..1....1..1
..1..0....0..1....0..0....0..0....0..1....0..1....0..1....0..0....1..1....1..1
..1..1....1..0....1..0....1..1....0..1....1..1....0..0....0..1....1..1....0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 03 2011
STATUS
approved