OFFSET
1,3
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) - 7*a(n-2) - 2*a(n-3) - 17*a(n-4) + 24*a(n-6) + 16*a(n-7) + 12*a(n-8) - 16*a(n-9) - 16*a(n-10).
Empirical g.f.: 2*x^3*(1 - 2*x^3)^2 / (1 - 3*x - x^2 - 2*x^3 + 2*x^4 + 4*x^5)^2. - Colin Barker, Feb 15 2019
EXAMPLE
Some solutions for n=4:
..0..0. .0..0. .0..0. .0..0. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1
..0..1. .1..1. .1..0. .1..1. .1..1. .1..0. .0..1. .0..0. .1..0. .1..1
..0..0. .0..1. .0..0. .1..0. .0..1. .0..0. .0..0. .0..1. .0..0. .1..0
..0..1. .1..1. .1..1. .1..1. .1..1. .1..0. .1..0. .0..0. .0..1. .1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2017
STATUS
approved