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