OFFSET
1,1
COMMENTS
Row 5 of A208028.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) + 19*a(n-2) - 9*a(n-3) - 42*a(n-4) + 31*a(n-5) + 3*a(n-6) - 4*a(n-7).
Empirical g.f.: 13*x*(1 + 10*x - x^2 - 38*x^3 + 28*x^4 + 3*x^5 - 4*x^6) / ((1 - x)*(1 - 2*x - 21*x^2 - 12*x^3 + 30*x^4 - x^5 - 4*x^6)). - Colin Barker, Jun 26 2018
EXAMPLE
Some solutions for n=4:
..0..1..1..0....0..1..1..0....1..1..1..0....0..1..1..1....0..1..0..0
..1..0..1..0....0..1..0..1....0..1..0..0....1..0..1..0....1..1..1..0
..1..0..1..1....1..1..0..1....0..1..0..1....1..0..1..0....1..1..0..1
..1..1..1..1....1..0..1..0....1..0..1..0....0..1..0..1....1..1..0..0
..1..1..1..1....1..0..1..0....1..0..1..0....0..1..0..0....1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
STATUS
approved