OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + 12*a(n-3) + 2*a(n-4) + 2*a(n-5) - 7*a(n-6) - a(n-7).
Empirical g.f.: x*(1 + 11*x + 14*x^2 + 4*x^3 - 5*x^4 - 8*x^5 - x^6) / (1 - x - 12*x^3 - 2*x^4 - 2*x^5 + 7*x^6 + x^7). - Colin Barker, Feb 28 2019
EXAMPLE
Some solutions for n=5:
..1..1..0..0. .0..1..1..1. .0..0..1..1. .0..1..1..0. .0..1..0..0
..0..1..1..0. .0..0..1..0. .0..1..1..0. .0..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
..0..1..1..1. .1..1..0..0. .0..0..1..1. .0..1..1..1. .1..1..0..0
..0..0..1..0. .1..1..0..0. .0..1..1..0. .0..0..1..0. .0..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2017
STATUS
approved