OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) - 56*a(n-3) + 64*a(n-4).
Empirical g.f.: 128*x*(3 - 3*x - 24*x^2 + 32*x^3) / ((1 - 7*x + 8*x^2)*(1 - 8*x^2)). - Colin Barker, Dec 20 2018
EXAMPLE
Some solutions for n=4:
..1..0..1....1..0..0....1..0..1....1..1..0....0..1..0....0..0..0....1..1..0
..0..1..0....0..0..1....1..0..0....1..1..1....0..1..0....1..1..1....1..1..0
..0..0..1....1..1..0....0..1..0....1..0..1....1..0..0....0..1..0....0..0..0
..1..1..1....0..0..0....1..0..1....1..0..0....0..0..1....0..1..0....1..1..0
..0..0..0....1..0..0....1..1..1....0..1..0....0..1..0....0..0..1....0..0..1
..1..1..1....1..0..1....0..0..1....0..0..0....0..0..1....0..1..1....1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2015
STATUS
approved