OFFSET
1,1
COMMENTS
Row 6 of A208085.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2).
Conjectures from Colin Barker, Jun 27 2018: (Start)
G.f.: 36*x*(3 + 2*x) / (1 - x - x^2).
a(n) = (9*2^(2-n)*((1-sqrt(5))^n*(-2+sqrt(5)) + (1+sqrt(5))^n*(2+sqrt(5)))) / sqrt(5).
(End)
EXAMPLE
Some solutions for n=4:
..0..0..0..1..0....0..1..0..1..1....0..0..0..0..0....0..0..0..1..0
..0..1..0..1..0....0..0..0..0..0....0..1..0..1..0....1..1..1..1..1
..1..0..1..0..1....0..0..0..0..0....1..0..1..0..1....1..1..1..1..1
..1..0..1..0..1....1..0..1..0..1....0..0..0..0..0....1..0..1..0..1
..0..1..0..1..0....0..1..0..1..0....0..0..0..0..0....0..1..0..1..0
..1..1..1..1..1....0..0..0..0..0....0..1..0..1..0....0..1..0..1..0
..1..1..1..1..1....0..0..0..0..0....1..0..1..0..1....1..0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2012
STATUS
approved