login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

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

A020118 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 1
5 4
6 20
7 121
8 862
9 7001
10 63876
11 646743
12 7195013
13 87239531
14 1145018832
15 16173391002
16 244622538903
17 3944538439806
18 67550220781672
19 1224347751667802
20 23415650750646696
21 471239971356764754

[1,1,1,1,1,4,20,121,862,7001,63876,646743,7195013,
 87239531,1145018832,16173391002,244622538903,
 3944538439806,67550220781672,1224347751667802,
 23415650750646696,471239971356764754]

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)