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A100734
a(n) = (5*n)!.
11
1, 120, 3628800, 1307674368000, 2432902008176640000, 15511210043330985984000000, 265252859812191058636308480000000, 10333147966386144929666651337523200000000
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OFFSET
0,2
LINKS
Vincenzo Librandi,
Table of n, a(n) for n = 0..90
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
Cf.
A000142
,
A010050
,
A100732
,
A100733
,
A268506
,
A269296
.
Sequence in context:
A308327
A172897
A258925
*
A115463
A003922
A210279
Adjacent sequences:
A100731
A100732
A100733
*
A100735
A100736
A100737
KEYWORD
nonn
,
easy
AUTHOR
Ralf Stephan
, Dec 08 2004
STATUS
approved
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Last modified April 25 11:29 EDT 2024. Contains 371967 sequences. (Running on oeis4.)