OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 7*a(n-1) - 2*a(n-2) + 19*a(n-3) - 50*a(n-4) - 2*a(n-5) - 48*a(n-6) + 88*a(n-7) - 32*a(n-8).
Empirical g.f.: x*(8 + 5*x - 2*x^2 - 56*x^3 - 24*x^4 - 4*x^5 + 72*x^6 - 32*x^7) / (1 - 7*x + 2*x^2 - 19*x^3 + 50*x^4 + 2*x^5 + 48*x^6 - 88*x^7 + 32*x^8). - Colin Barker, Feb 22 2019
EXAMPLE
Some solutions for n=4:
..1..1..0. .1..0..1. .1..1..0. .0..0..0. .1..0..1. .1..0..0. .1..1..1
..0..1..0. .0..0..0. .0..1..0. .0..1..0. .0..0..1. .1..1..0. .0..0..1
..1..1..0. .1..1..1. .0..0..1. .1..1..0. .0..1..1. .0..0..0. .1..0..1
..0..0..1. .0..1..1. .0..1..1. .1..1..1. .1..0..0. .1..1..0. .0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 17 2017
STATUS
approved