login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A307031 n to the power n double factorial, n^(n!!). 0
1, 4, 27, 65536, 30517578125, 22452257707354557240087211123792674816, 54361846697263307560529495055267343940077014163990039113495978834700158362117849904436807 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The next term -- a(8) -- has 347 digits. - Harvey P. Dale, Aug 11 2021
LINKS
Eric Weisstein's World of Mathematics, Double Factorial
FORMULA
a(n) = n^(n!!).
MATHEMATICA
Table[n^n!!, {n, 7}] (* Harvey P. Dale, Aug 11 2021 *)
PROG
(Python)
def doublefactorial(n):
if n <= 0:
return 1
else:
return n * doublefactorial(n-2)
for n in range(1, m):
print(n**doublefactorial(n))
CROSSREFS
Sequence in context: A292968 A000869 A132640 * A306823 A174212 A352838
KEYWORD
nonn
AUTHOR
Mark Stander, Mar 20 2019
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)