OFFSET
1,1
COMMENTS
Row 6 of A200785.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..136
FORMULA
Empirical: a(n) = (6679/20160)*n^8 + (4799/1260)*n^7 + (26449/1440)*n^6 + (2162/45)*n^5 + (212153/2880)*n^4 + (6019/90)*n^3 + (174571/5040)*n^2 + (3893/420)*n + 1.
Conjectures from Colin Barker, Oct 15 2017: (Start)
G.f.: x*(256 + 2853*x + 6484*x^2 + 3294*x^3 + 522*x^4 - 79*x^5 + 36*x^6 - 9*x^7 + x^8) / (1 - x)^9.
a(n) = 9*a(n-1) - 36*a(n-2) + 84*a(n-3) - 126*a(n-4) + 126*a(n-5) - 84*a(n-6) + 36*a(n-7) - 9*a(n-8) + a(n-9) for n>9.
(End)
EXAMPLE
Some solutions for n=3
..3....1....2....2....0....2....1....2....2....3....0....0....0....3....3....1
..0....1....0....2....2....3....3....2....1....3....0....1....1....0....0....3
..0....3....3....1....0....1....3....1....2....0....3....0....1....0....3....1
..1....3....2....2....3....3....2....2....0....2....0....0....1....3....3....2
..0....1....3....2....1....3....3....1....0....1....2....3....3....1....0....0
..3....0....2....2....3....0....3....3....3....3....1....2....0....2....0....3
..0....1....1....2....0....0....2....0....1....0....3....1....2....1....3....1
..3....0....3....3....3....1....3....0....0....3....1....0....2....3....1....0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 22 2011
STATUS
approved