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!)
A216628 a(n) = A163085(n)/n!. 1
1, 1, 1, 2, 3, 18, 60, 1200, 10500, 735000, 18522000, 4667544000, 359400888000, 332086420512000, 81408613942656000, 279394363051195392000, 224737840779305293440000, 2892376010829659126572800000, 7812628980363223707442752000000, 379850021025259936655866602240000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
PROG
(Sage)
def A216628(n):
swing = lambda n: factorial(n)/factorial(n//2)^2
A163085 = lambda n: mul(swing(i) for i in (0..n))
return A163085(n)/factorial(n)
[A216628(n) for n in (0..19)]
CROSSREFS
Cf. A056040.
Sequence in context: A347429 A211867 A003693 * A048047 A114165 A166510
KEYWORD
nonn
AUTHOR
Peter Luschny, Sep 18 2012
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 20 00:26 EDT 2024. Contains 371798 sequences. (Running on oeis4.)