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!)

A057693 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 18
5 66
6 276
7 1212
8 5916
9 31068
10 171576
11 1014696
12 6319512
13 41143896
14 281590128
15 2007755856
16 14871825936
17 114577550352
18 913508184096
19 7526682826848
20 64068860545056
21 561735627038496
22 5068388485760832
23 47026385852423616
24 447837548306401728

[1,1,2,6,18,66,276,1212,5916,31068,171576,1014696,
 6319512,41143896,281590128,2007755856,14871825936,
 114577550352,913508184096,7526682826848,
 64068860545056,561735627038496,5068388485760832,
 47026385852423616,447837548306401728]

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 12 03:27 EST 2018. Contains 318052 sequences. (Running on oeis4.)