OFFSET
2,3
LINKS
Chai Wah Wu, Table of n, a(n) for n = 2..453
Natasha Morrison and Alex Scott, Maximizing the number of induced cycles in a graph, Preprint, 2016. See Conj. 1.1.
EXAMPLE
1, 1/4, 2/21, 1/26, 24/1555, 5/817, 720/299593, 126/134521, 4480/12345679, 6048/43229041, 3628800/67546215517, 95040/4622635937, 479001600/61054982558011, ...
MATHEMATICA
Table[Numerator[n! / (n^n - n)], {n, 2, 30}] (* Vincenzo Librandi, Sep 12 2016 *)
PROG
(Python)
from __future__ import division
from math import factorial
from fractions import gcd
def A276399(n):
a = factorial(n-1)
return a//gcd(n**(n-1)-1, a) # Chai Wah Wu, Sep 11 2016
(Magma) [Numerator(Factorial(n)/(n^n-n)): n in [2..25]]; // Vincenzo Librandi, Sep 12 2016
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Sep 11 2016
STATUS
approved