OFFSET
1,1
COMMENTS
Row 5 of A208501.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 6*a(n-2) - 3*a(n-3) for n>5.
Empirical g.f.: 13*x*(1 + 12*x - x^2 - 43*x^3 + 19*x^4) / (1 - x - 6*x^2 + 3*x^3). - Colin Barker, Jul 03 2018
EXAMPLE
Some solutions for n=4:
..0..1..1..1....1..1..1..1....1..1..0..0....1..0..1..1....0..1..0..0
..0..1..0..1....0..1..0..1....1..0..1..1....0..1..1..1....1..1..0..1
..1..0..1..0....1..0..1..0....0..1..1..1....1..1..0..0....1..0..1..1
..1..0..1..1....1..0..1..0....0..1..0..0....1..0..1..0....0..1..1..0
..0..1..0..1....0..1..0..1....1..0..1..0....0..1..1..1....0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 27 2012
STATUS
approved