OFFSET
1,1
COMMENTS
Row 7 of A208287.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) + 16*a(n-2) - 7*a(n-3) - 23*a(n-4) + 2*a(n-5) + 9*a(n-6) - a(n-8).
Empirical g.f.: 14*x*(1 + x)*(1 + 9*x - 12*x^2 - 6*x^3 + 7*x^4 + x^5 - x^6) / (1 - 4*x - 16*x^2 + 7*x^3 + 23*x^4 - 2*x^5 - 9*x^6 + x^8). - Colin Barker, Jun 30 2018
EXAMPLE
Some solutions for n=4:
..0..1..0..1....0..1..1..1....1..0..1..1....0..1..1..1....1..0..1..0
..1..0..1..0....1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..0
..0..1..0..0....1..1..0..1....1..0..1..0....1..0..1..1....1..0..1..0
..1..1..0..0....1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..0
..0..1..0..0....1..1..0..1....1..0..1..0....1..0..1..1....1..0..1..0
..1..1..0..0....1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..0
..0..1..0..0....1..1..0..0....1..0..1..0....1..0..1..1....1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 2012
STATUS
approved