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

 

Logo

Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS").
Other ways to donate

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

A022917 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 60
6 180
7 630
8 2520
9 7560
10 25200
11 92400
12 369600
13 1201200
14 4204200
15 15765750
16 63063000
17 214414200
18 771891120
19 2933186256
20 11732745024
21 41064607584
22 150570227808
23 577185873264
24 2308743493056
25 8245512475200

[1,1,2,6,24,60,180,630,2520,7560,25200,92400,
 369600,1201200,4204200,15765750,63063000,
 214414200,771891120,2933186256,11732745024,
 41064607584,150570227808,577185873264,
 2308743493056,8245512475200]

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 14 23:10 EST 2018. Contains 318141 sequences. (Running on oeis4.)