OFFSET
1,1
COMMENTS
Column 1 of A209716.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 34*a(n-2) + 30*a(n-3) - 76*a(n-4) - 24*a(n-5) + 16*a(n-6).
Empirical g.f.: x*(24 + 127*x + 75*x^2 - 276*x^3 - 92*x^4 + 64*x^5) / (1 - 2*x - 34*x^2 - 30*x^3 + 76*x^4 + 24*x^5 - 16*x^6). - Colin Barker, Jul 12 2018
EXAMPLE
Some solutions for n=4:
..0..1....0..2....3..2....0..0....0..1....2..0....3..3....1..3....3..3....3..1
..0..3....0..3....2..0....1..3....0..3....2..3....2..0....1..0....0..1....1..0
..2..2....2..2....2..3....2..1....0..1....2..0....0..3....3..1....2..3....3..1
..3..0....3..0....2..0....0..2....3..0....2..3....1..1....1..0....2..0....1..0
..3..2....0..1....1..2....3..3....1..1....0..2....3..0....0..2....1..2....3..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2012
STATUS
approved