OFFSET
1,1
COMMENTS
Column 1 of A200668.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n)=a(n-1)+a(n-2)-a(n-5)-a(n-6)+a(n-7).
Empirical g.f.: x*(1 + x^2)*(2 + x - 2*x^2 - x^3 + x^4) / ((1 - x)*(1 - x^2 - x^3 - x^4 + x^6)). - Colin Barker, May 21 2018
EXAMPLE
Some solutions for n=6:
..0....0....0....0....0....1....0....0....0....1....1....1....0....0....1....0
..0....0....0....0....0....1....1....1....1....1....1....1....0....1....1....0
..0....1....0....0....1....0....1....1....1....0....0....0....0....1....1....1
..1....1....1....0....1....1....0....0....0....0....1....1....0....1....1....1
..1....0....1....0....1....1....0....1....1....1....0....1....0....1....1....0
..0....1....1....1....1....1....1....0....1....1....1....0....0....1....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 20 2011
STATUS
approved