OFFSET
1,2
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) + a(n-2) + 8*a(n-3) + 7*a(n-4) - 8*a(n-6) - 6*a(n-7).
Empirical g.f.: x*(1 + 8*x + 15*x^2 + 7*x^3 - 8*x^4 - 14*x^5 - 6*x^6) / (1 - x - x^2 - 8*x^3 - 7*x^4 + 8*x^6 + 6*x^7). - Colin Barker, Mar 01 2019
EXAMPLE
Some solutions for n=7:
..1..0..0..1..1..0..0. .0..0..0..1..1..0..0. .1..0..1..0..0..0..0
..0..1..0..0..0..0..0. .0..1..0..0..0..0..0. .1..1..1..0..0..1..0
..0..0..0..0..0..0..0. .1..0..0..0..0..1..1. .1..0..0..0..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2018
STATUS
approved