OFFSET
1,1
COMMENTS
Column 3 of A221035.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8*a(n-1) - 8*a(n-2) - a(n-3) + 5*a(n-4) - 2*a(n-5).
Empirical g.f.: x*(4 + x - 4*x^2 + 5*x^3 - 3*x^4) / (1 - 8*x + 8*x^2 + x^3 - 5*x^4 + 2*x^5). - Colin Barker, Mar 13 2018
EXAMPLE
Some solutions for n=3:
..0..0..1....0..0..1....0..0..1....0..0..1....0..0..0....0..1..1....0..0..1
..0..0..0....0..1..1....1..1..0....1..0..0....0..1..1....1..0..0....1..1..1
..0..0..0....0..0..1....0..0..1....0..0..0....1..0..0....1..0..0....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2012
STATUS
approved