OFFSET
1,1
COMMENTS
Column 4 of A205318.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 17*a(n-1) -81*a(n-2) +157*a(n-3) -140*a(n-4) +56*a(n-5) -8*a(n-6).
Empirical g.f.: 4*x*(41 - 270*x + 600*x^2 - 580*x^3 + 244*x^4 - 36*x^5) / ((1 - x)*(1 - 16*x + 65*x^2 - 92*x^3 + 48*x^4 - 8*x^5)). - Colin Barker, Jun 11 2018
EXAMPLE
Some solutions for n=4:
..0..0..1..0..0....0..0..0..0..1....0..1..0..1..0....0..1..0..1..0
..1..1..1..1..1....0..1..1..0..0....1..1..0..0..0....0..0..0..0..0
..1..0..0..0..0....1..1..0..0..1....1..0..0..1..0....0..1..1..0..1
..1..1..1..1..0....0..0..0..1..1....1..1..0..1..1....1..1..0..0..1
..0..1..0..0..0....1..1..0..0..1....1..0..0..1..0....1..0..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 25 2012
STATUS
approved