OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) - 5*a(n-2) - 66*a(n-3) + 78*a(n-4) + 4*a(n-5) - 16*a(n-6).
Empirical g.f.: x*(3 - 10*x - x^2 - 2*x^3 + 16*x^4 - 8*x^5) / (1 - 9*x + 5*x^2 + 66*x^3 - 78*x^4 - 4*x^5 + 16*x^6). - Colin Barker, Oct 01 2018
EXAMPLE
Some solutions for n=7:
..0..1..2..2..0..0..0....0..0..1..2..2..0..2....0..2..2..2..0..2..1
..0..2..2..0..1..1..2....0..1..2..0..1..2..2....0..0..1..1..0..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 15 2013
STATUS
approved