OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) - 6*a(n-2) - 7*a(n-3) + 21*a(n-4) - 14*a(n-5) - a(n-6) + 4*a(n-7) - a(n-8).
Empirical g.f.: x*(55 - 133*x - 44*x^2 + 335*x^3 - 256*x^4 - 10*x^5 + 68*x^6 - 17*x^7) / ((1 - x)^3*(1 - 2*x - 3*x^2 + 5*x^3 + x^4 - x^5)). - Colin Barker, Nov 15 2018
EXAMPLE
Some solutions for n=6:
..0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..0
..0..0..0..1....0..0..0..1....1..0..1..1....0..0..1..1....1..0..0..1
..1..0..1..1....0..0..0..1....0..1..1..1....0..1..0..1....0..1..1..1
..0..1..1..1....0..0..0..1....1..0..1..1....1..0..1..0....1..1..1..1
..1..0..1..1....0..0..0..1....0..1..1..1....0..1..0..1....1..1..1..1
..0..1..1..1....1..0..1..0....1..0..1..1....1..0..1..0....0..1..1..1
..1..1..1..1....0..1..0..1....0..1..1..1....0..1..0..1....1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 25 2014
STATUS
approved