OFFSET
1,1
COMMENTS
Column 2 of A210052.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 14*a(n-1) - 41*a(n-2) - 66*a(n-3) + 100*a(n-4) + 56*a(n-5) - 32*a(n-6).
Empirical g.f.: x*(9 - 7*x - 26*x^2 + 56*x^3 + 24*x^4 - 16*x^5) / ((1 - 6*x - 3*x^2 + 2*x^3)*(1 - 8*x - 4*x^2 + 16*x^3)). - Colin Barker, Jul 14 2018
EXAMPLE
Some solutions for n=4:
..0..0..1....0..0..1....0..0..0....0..1..2....0..1..2....0..0..0....0..1..2
..1..1..1....2..0..0....0..1..0....0..1..2....0..1..2....0..1..0....0..1..2
..2..1..2....2..0..2....1..0..1....0..1..2....0..1..2....0..0..1....0..1..1
..2..2..1....2..0..2....1..1..1....0..1..2....1..1..2....1..0..0....1..0..0
..1..1..2....2..2..2....2..1..2....0..1..1....0..1..1....1..0..2....0..0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 16 2012
STATUS
approved