OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) - 2*a(n-2) - 3*a(n-3).
Empirical g.f.: x*(5 - 3*x - 4*x^2) / (1 - 5*x + 2*x^2 + 3*x^3). - Colin Barker, Feb 26 2019
EXAMPLE
Some solutions for n=5:
..0..0..1. .0..0..0. .0..0..1. .1..0..1. .0..0..0. .0..1..0. .0..0..0
..1..0..1. .0..0..1. .0..0..0. .1..0..1. .1..0..1. .0..1..1. .0..0..0
..0..0..1. .1..0..1. .1..0..0. .0..0..0. .0..0..1. .1..1..0. .0..1..0
..1..0..1. .0..0..0. .1..0..0. .0..1..1. .1..0..1. .0..1..0. .0..0..1
..0..0..0. .0..0..1. .1..0..1. .1..1..0. .0..0..1. .0..0..1. .1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2017
STATUS
approved