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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

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

A228173 as a simple table

n a(n)
1 1
2 2
3 12
4 108
5 1320
6 20280
7 374640
8 8072400
9 198465120
10 5475284640
11 167285321280
12 5600184004800
13 203602252613760
14 7978382871338880
15 334767145102790400
16 14952953514231532800
17 707221717016278464000
18 35242469168705967168000
19 1841491290250262851200000

[1,2,12,108,1320,20280,374640,8072400,198465120,
 5475284640,167285321280,5600184004800,
 203602252613760,7978382871338880,
 334767145102790400,14952953514231532800,
 707221717016278464000,35242469168705967168000,
 1841491290250262851200000]

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 15 17:03 EST 2019. Contains 330000 sequences. (Running on oeis4.)