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!)

A171661 as a simple table

n a(n)
0 1
1 2
2 2
3 6
4 6
5 4
6 20
7 20
8 14
9 8
10 70
11 70
12 50
13 30
14 16
15 252
16 252
17 182
18 112
19 62
20 32
21 924
22 924
23 672
24 420
25 238
26 126
27 64
28 3432
29 3432
30 2508
31 1584
32 912
33 492
34 254
35 128
36 12870
37 12870
38 9438
39 6006
40 3498
41 1914
42 1002
43 510
44 256
45 48620
46 48620
47 35750
48 22880
49 13442
50 7436

[1,2,2,6,6,4,20,20,14,8,70,70,50,30,16,252,252,
 182,112,62,32,924,924,672,420,238,126,64,3432,
 3432,2508,1584,912,492,254,128,12870,12870,9438,
 6006,3498,1914,1002,510,256,48620,48620,35750,
 22880,13442,7436]

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 4 12:45 EST 2024. Contains 370532 sequences. (Running on oeis4.)