OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) - a(n-2) + a(n-3) - 2*a(n-4) + a(n-5).
Empirical g.f.: x*(2 - x + x^2 - 3*x^3 + 2*x^4) / ((1 - x)^3*(1 + x + x^2)). - Colin Barker, Jan 10 2019
EXAMPLE
Some solutions for n=6:
..0..1..1....0..1..1....0..0..1....0..1..1....0..1..1....0..1..1....0..0..1
..0..1..1....1..0..1....0..1..0....1..0..0....0..1..1....0..1..1....0..0..1
..1..0..1....1..1..0....0..1..0....1..0..0....0..1..1....1..0..0....0..1..0
..1..0..1....1..1..0....1..0..0....1..0..0....1..0..0....1..0..0....0..1..0
..1..1..0....1..1..0....1..0..0....1..0..0....1..0..0....1..0..0....1..0..0
..1..1..0....1..1..0....1..0..0....1..0..0....1..0..0....1..0..0....1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2015
STATUS
approved