OFFSET
1,1
COMMENTS
Column 5 of A256816.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) -a(n-2) +2*a(n-3) -a(n-4) +2*a(n-5) -a(n-6).
Empirical g.f.: x*(63 - 2*x + 60*x^2 - 8*x^3 + 48*x^4 - 32*x^5) / (1 - 2*x + x^2 - 2*x^3 + x^4 - 2*x^5 + x^6). - Colin Barker, Jan 24 2018
EXAMPLE
Some solutions for n=4:
..1....1....0....0....0....1....0....1....1....1....0....1....0....1....0....1
..1....0....1....1....1....0....1....1....0....0....0....0....0....1....0....0
..0....0....1....1....1....0....0....0....0....1....0....0....1....1....1....0
..0....0....0....1....0....0....1....0....0....1....0....1....0....1....0....0
..0....0....0....0....0....0....1....0....1....1....1....1....0....1....1....0
..1....1....1....0....1....0....0....0....0....0....1....0....1....1....1....1
..1....0....1....0....0....1....1....0....1....0....1....0....1....0....1....0
..0....1....1....1....1....0....0....1....1....0....0....0....0....0....1....0
..1....1....0....0....1....0....0....0....1....0....0....0....1....1....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 10 2015
STATUS
approved