OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 3*a(n-2) - 4*a(n-3) - 6*a(n-4) + 2*a(n-5) + 4*a(n-6) - a(n-8).
Empirical g.f.: 2*x*(1 + x)*(1 + 11*x + 7*x^2 - 8*x^3 - 9*x^4 + 2*x^6) / (1 - x - 2*x^2 + x^4)^2. - Colin Barker, Feb 16 2019
EXAMPLE
Some solutions for n=4:
..0..0..1..0. .0..0..1..1. .0..0..1..1. .0..1..0..1. .0..1..0..1
..1..0..1..1. .1..0..0..1. .1..0..0..0. .0..1..1..0. .0..1..0..1
..1..0..0..0. .1..1..0..1. .1..0..1..0. .0..0..1..0. .1..0..1..0
..1..0..1..1. .0..1..1..1. .1..0..1..0. .1..0..1..1. .1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2017
STATUS
approved