OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 5*a(n-2) + 2*a(n-3).
Conjectures from Colin Barker, Nov 19 2018: (Start)
G.f.: 2*x*(23 - 39*x + 18*x^2) / ((1 - x)^2*(1 - 2*x)).
a(n) = 2^(5+n) - 4*n - 14.
(End)
EXAMPLE
Some solutions for n=4:
..0..1..0..1....1..0..0..0....0..0..1..0....0..0..0..0....1..0..0..1
..0..1..0..1....1..0..0..0....0..1..0..1....0..0..0..1....1..0..0..1
..1..0..1..0....1..0..0..0....0..1..0..1....0..0..1..0....1..0..1..0
..0..1..0..1....1..0..0..1....0..1..0..1....0..0..1..0....1..0..1..0
..1..0..1..0....1..0..0..1....0..1..0..1....0..0..1..0....1..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 27 2014
STATUS
approved