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A100734
a(n) = (5*n)!.
11
1, 120, 3628800, 1307674368000, 2432902008176640000, 15511210043330985984000000, 265252859812191058636308480000000, 10333147966386144929666651337523200000000
OFFSET
0,2
LINKS
FORMULA
E.g.f.: 1/(1-x^5).
From Ilya Gutkovskiy, Jan 20 2017: (Start)
a(n) ~ sqrt(2*Pi)*5^(5*n + 1/2)*n^(5*n + 1/2)/exp(5*n).
Sum_{n>=0} 1/a(n) = A269296. (End)
MATHEMATICA
(5*Range[0, 10])! (* Harvey P. Dale, May 06 2015 *)
PROG
(Magma) [Factorial(5*n): n in [0..10]]; // Vincenzo Librandi, Sep 24 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Ralf Stephan, Dec 08 2004
STATUS
approved