OFFSET
1,1
COMMENTS
Column 2 of A224550.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 5*a(n-2) + a(n-3) + 2*a(n-4) - a(n-5).
Empirical g.f.: x*(16 - 32*x + 4*x^2 + 22*x^3 - 11*x^4) / ((1 - x)^3*(1 - x - x^2)). - Colin Barker, Aug 30 2018
EXAMPLE
Some solutions for n=3:
..1..1..1....0..0..0....1..1..1....1..0..0....1..0..0....1..0..0....1..0..0
..0..0..0....0..0..0....0..0..0....1..0..0....1..0..0....0..0..0....1..0..1
..0..0..0....0..0..0....0..0..1....1..0..0....1..0..0....0..0..0....1..0..1
..0..0..0....0..1..1....0..0..1....1..0..0....0..0..0....1..1..1....1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 10 2013
STATUS
approved