OFFSET
1,1
COMMENTS
Row 2 of A200871.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/12)*n^4 + (3/2)*n^3 + (47/12)*n^2 + (7/2)*n + 1.
Conjectures from Colin Barker, Oct 16 2017: (Start)
G.f.: x*(10 - 13*x + 9*x^2 - 5*x^3 + x^4) / (1 - x)^5.
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n>5.
(End)
EXAMPLE
Some solutions for n=3
..1....0....2....0....3....0....2....2....1....0....0....0....3....0....3....0
..2....2....3....1....3....0....2....2....3....2....0....0....2....2....1....1
..2....3....3....1....2....1....1....2....3....2....0....1....2....2....1....3
..1....3....0....0....1....1....0....2....1....1....0....2....2....0....1....3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 23 2011
STATUS
approved