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!)

A306905 as a simple table

n a(n)
1 1
2 4
3 6
4 16
5 20
6 48
7 70
8 160
9 270
10 560
11 1034
12 2160
13 4108
14 8344
15 16440
16 33088
17 65552
18 131688
19 262162
20 525440
21 1048740
22 2099240
23 4194326
24 8393184
25 16777300
26 33562672
27 67109418
28 134234464
29 268435484
30 536904960
31 1073741854
32 2147549824
33 4294969404

[1,4,6,16,20,48,70,160,270,560,1034,2160,4108,
 8344,16440,33088,65552,131688,262162,525440,
 1048740,2099240,4194326,8393184,16777300,33562672,
 67109418,134234464,268435484,536904960,1073741854,
 2147549824,4294969404]

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 13 06:26 EST 2019. Contains 329968 sequences. (Running on oeis4.)