OFFSET
1,1
COMMENTS
Column 2 of A201625
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/1307674368000)*n^15 - (1/21794572800)*n^14 + (29/9340531200)*n^13 - (19/159667200)*n^12 + (4553/1026432000)*n^11 - (5303/43545600)*n^10 + (2614/893025)*n^9 - (17060387/304819200)*n^8 + (1165550053/1306368000)*n^7 - (165570521/14515200)*n^6 + (11927742139/102643200)*n^5 - (109390684973/119750400)*n^4 + (12109762378249/2270268000)*n^3 - (3278349949289/151351200)*n^2 + (6533366639/120120)*n - 63345 for n>8
EXAMPLE
Some solutions for n=9
..0..0....0..1....0..2....0..1....0..3....1..1....0..2....0..2....0..1....0..0
..2..3....0..1....0..2....0..1....0..3....1..1....0..2....0..2....0..1....0..0
..2..3....0..1....0..3....1..1....1..1....1..3....3..0....1..0....0..1....0..1
..2..3....0..2....0..3....2..1....2..0....1..3....3..0....1..0....1..1....0..1
..2..3....2..2....1..2....2..1....2..0....1..3....3..0....1..1....2..0....0..1
..3..0....2..3....1..2....2..1....3..3....1..3....3..2....2..1....2..0....0..3
..3..0....2..3....2..0....2..2....3..3....3..2....3..2....2..1....2..0....0..3
..3..1....3..3....2..0....3..1....3..3....3..2....3..2....2..1....2..0....2..2
..3..1....3..3....2..0....3..1....3..3....3..2....3..2....2..2....2..0....3..3
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 03 2011
STATUS
approved