OFFSET
1,1
COMMENTS
Row 4 of A224391
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (3551/47900160)*n^12 + (17561/13305600)*n^11 + (410317/21772800)*n^10 + (127787/725760)*n^9 + (394837/290304)*n^8 + (4724393/1209600)*n^7 + (880093831/21772800)*n^6 - (673403/80640)*n^5 + (476636641/1088640)*n^4 + (58121267/907200)*n^3 - (1924453/415800)*n^2 - (1998055/2772)*n + 1906 for n>4
EXAMPLE
Some solutions for n=3
..0..0..1....0..1..2....3..3..3....0..3..3....0..0..3....2..2..2....1..1..3
..0..2..3....0..3..3....0..1..3....2..3..3....0..1..1....2..3..3....3..3..3
..2..2..2....2..3..3....0..0..1....2..3..3....1..1..2....0..2..3....1..3..3
..1..2..3....0..2..3....0..1..2....2..2..3....0..0..2....2..3..3....0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 05 2013
STATUS
approved