OFFSET
1,2
COMMENTS
Column 3 of A203285.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) -13*a(n-3) -a(n-4) +44*a(n-5) -26*a(n-6) +12*a(n-8) -8*a(n-9).
Empirical g.f.: 4*x^2*(1 + 2*x - 19*x^2 + 26*x^3 - 12*x^4 - 2*x^5 + 8*x^6 - 8*x^7) / ((1 - 5*x + 3*x^2 - 2*x^3)*(1 - 3*x^2 + 10*x^4 - 4*x^6)). - Colin Barker, Jun 04 2018
EXAMPLE
Some solutions for n=4:
..1..1..0....1..1..1....1..1..0....0..0..0....0..1..1....0..1..0....1..0..1
..0..1..0....0..0..0....0..0..0....1..1..1....0..0..0....0..1..0....1..0..1
..0..0..0....1..1..1....1..1..1....1..0..1....1..1..1....1..1..1....0..0..0
..1..1..1....0..0..0....0..0..0....0..0..1....1..0..0....1..0..0....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2011
STATUS
approved