OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) - 5*a(n-2) + 2*a(n-3).
Empirical g.f.: x*(1 - x)^2 / (1 - 5*x + 5*x^2 - 2*x^3). - Colin Barker, Feb 11 2019
EXAMPLE
Some solutions for n=4:
..0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..1..1. .0..1..0. .0..1..1
..0..1..0. .1..0..1. .0..1..0. .0..1..1. .0..0..1. .0..1..0. .0..0..1
..1..0..1. .1..0..1. .0..0..1. .1..0..0. .1..0..0. .1..0..0. .0..1..1
..1..0..1. .0..1..0. .1..0..1. .0..1..0. .1..1..0. .1..1..0. .0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2016
STATUS
approved