login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)

A117998 as a simple table

n a(n)
0 1
1 6
2 20
3 120
4 272
5 1632
6 5440
7 32640
8 65792
9 394752
10 1315840
11 7895040
12 17895424
13 107372544
14 357908480
15 2147450880
16 4295032832
17 25770196992
18 85900656640
19 515403939840
20 1168248930304
21 7009493581824
22 23364978606080

[1,6,20,120,272,1632,5440,32640,65792,394752,
 1315840,7895040,17895424,107372544,357908480,
 2147450880,4295032832,25770196992,85900656640,
 515403939840,1168248930304,7009493581824,
 23364978606080]

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

License Agreements, Terms of Use, Privacy Policy .

Last modified December 10 23:40 EST 2016. Contains 279021 sequences.