login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

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

A132847 as a simple table

n a(n)
0 1
1 2
2 9
3 42
4 270
5 1785
6 13657
7 108606
8 943677
9 8534290
10 82099523
11 819569205
12 8575756709
13 92782439316
14 1042810799150
15 12077608219410
16 144446181373140
17 1774918640030754
18 22425992057948620
19 290381947113460848

[1,2,9,42,270,1785,13657,108606,943677,8534290,
 82099523,819569205,8575756709,92782439316,
 1042810799150,12077608219410,144446181373140,
 1774918640030754,22425992057948620,
 290381947113460848]

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 4 02:40 EST 2021. Contains 349469 sequences. (Running on oeis4.)