OFFSET
1,1
COMMENTS
Column 1 of A206752.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 15*a(n-1) - 55*a(n-2) + 17*a(n-3) + 108*a(n-4) - 84*a(n-5).
Empirical g.f.: 32*x*(8 - 61*x + 45*x^2 + 126*x^3 - 126*x^4) / ((1 - x)*(1 - 3*x - 6*x^2)*(1 - 11*x + 14*x^2)). - Colin Barker, Jun 17 2018
EXAMPLE
Some solutions for n=4:
..1..0....2..3....1..1....1..1....2..3....1..1....0..0....3..3....0..3....1..3
..2..0....3..0....2..2....1..3....1..1....1..2....1..0....1..1....1..1....2..2
..1..0....0..2....1..1....3..3....2..3....1..2....0..1....1..3....3..2....0..3
..1..3....1..3....0..0....2..2....0..3....3..0....1..3....2..0....0..2....2..2
..0..0....2..0....0..0....0..2....1..3....1..2....3..0....0..1....0..3....1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2012
STATUS
approved