OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 13*a(n-2) - 7*a(n-3) - 32*a(n-4) + 8*a(n-5) + 10*a(n-6).
Empirical g.f.: 2*x*(19 + 56*x - 90*x^2 - 189*x^3 + 72*x^4 + 71*x^5) / (1 - x - 13*x^2 + 7*x^3 + 32*x^4 - 8*x^5 - 10*x^6). - Colin Barker, Nov 27 2018
EXAMPLE
Some solutions for n=4:
..1..1..0..1....1..1..1..0....1..1..1..1....0..0..0..1....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1....1..1..0..1
..1..0..1..0....0..1..1..1....0..1..1..1....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1....1..0..1..0
..1..1..0..1....0..1..0..1....1..1..1..0....0..0..0..0....1..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 01 2014
STATUS
approved