OFFSET
1,1
COMMENTS
Column 1 of A210335.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 12*a(n-1) - 7*a(n-2) - 108*a(n-3) + 22*a(n-4) + 258*a(n-5) + 124*a(n-6).
Empirical g.f.: x*(39 - 62*x - 399*x^2 + 173*x^3 + 1065*x^4 + 496*x^5) / ((1 + 2*x)*(1 - 14*x + 35*x^2 + 38*x^3 - 98*x^4 - 62*x^5)). - Colin Barker, Jul 15 2018
EXAMPLE
Some solutions for n=4:
..2..0....2..3....1..2....0..2....1..1....1..0....0..1....2..2....2..1....2..0
..1..3....1..1....0..0....0..0....2..0....0..1....1..2....0..2....0..0....2..2
..1..3....1..3....1..0....1..1....1..0....0..2....0..2....3..1....3..0....1..1
..1..1....3..3....0..0....2..0....0..0....3..1....2..2....0..2....0..3....0..1
..3..2....1..3....0..3....2..0....0..3....1..1....0..0....2..0....1..2....1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2012
STATUS
approved