OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) + 13*a(n-2) + 10*a(n-3) + a(n-4) + 2*a(n-5) for n>7.
Empirical g.f.: x*(1 + x)*(8 + 13*x - 6*x^2 - 3*x^3 + x^4 - 2*x^5) / (1 - 5*x - 13*x^2 - 10*x^3 - x^4 - 2*x^5). - Colin Barker, Feb 21 2019
EXAMPLE
Some solutions for n=4:
..0..0..1. .1..0..0. .1..0..1. .1..0..0. .1..0..1. .0..0..0. .0..1..1
..0..0..1. .0..0..1. .0..1..0. .1..0..0. .1..1..0. .0..1..0. .0..0..1
..1..1..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .1..0..0. .1..1..0
..1..0..1. .0..0..1. .0..1..1. .1..1..0. .0..0..1. .0..1..0. .0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 07 2017
STATUS
approved