OFFSET
1,1
COMMENTS
Column 2 of A224064
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/19160064)*n^12 + (1/456192)*n^11 + (2287/43545600)*n^10 + (215/290304)*n^9 + (2861/414720)*n^8 + (7187/161280)*n^7 + (10695901/43545600)*n^6 + (212027/207360)*n^5 + (6072841/2177280)*n^4 + (1652783/362880)*n^3 + (1059277/237600)*n^2 + (26023/13860)*n + 1
EXAMPLE
Some solutions for n=3
..3..0....2..3....1..1....0..0....0..0....2..1....0..0....0..3....1..0....0..0
..1..3....3..3....1..2....1..1....2..1....1..3....3..0....1..3....2..2....0..0
..1..1....2..3....2..3....1..2....2..3....0..1....0..3....2..2....1..3....2..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2013
STATUS
approved