OFFSET
1,1
COMMENTS
Column 3 of A223949.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 2*a(n-2) - a(n-3) + 5*a(n-4) - 8*a(n-5).
Empirical g.f.: x*(4 - 2*x^2 - 3*x^3 - 8*x^4) / (1 - 4*x + 2*x^2 + x^3 - 5*x^4 + 8*x^5). - Colin Barker, Aug 24 2018
EXAMPLE
Some solutions for n=3:
..0..1..1....0..0..0....1..1..1....0..0..0....0..1..1....0..0..0....1..1..1
..0..0..1....0..0..1....1..1..1....0..0..1....1..1..1....1..1..1....0..0..0
..0..1..1....1..1..1....0..0..1....0..0..1....1..1..1....0..0..0....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2013
STATUS
approved