OFFSET
1,1
COMMENTS
Row 4 of A214384
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..163
FORMULA
Empirical: a(n) = (109/226800)*n^10 + (1531/90720)*n^9 + (6911/30240)*n^8 + (4553/3024)*n^7 + (27071/5400)*n^6 + (34159/4320)*n^5 + (409217/90720)*n^4 - (4937/4536)*n^3 - (22087/12600)*n^2 - (43/126)*n
EXAMPLE
Some solutions for n=3
.....3........2........2........2........2........3........2........2
....3.2......1.2......3.0......2.3......2.1......2.3......0.2......1.2
...1.3.0....0.1.2....3.2.0....0.3.2....2.1.2....1.3.0....0.1.2....0.3.2
..0.1.3.0..1.0.3.2..3.0.3.0..0.1.3.1..2.0.1.3..0.3.0.2..0.2.1.2..0.2.3.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 14 2012
STATUS
approved