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!)

A221020 as a simple table

n a(n)
1 1
2 1
3 1
4 2
5 3
6 6
7 5
8 360
9 420
10 56
11 756
12 75600
13 415800
14 2494800
15 8424
16 1223040
17 504504000
18 9081072000
19 5145940800
20 111152321280
21 754247894400
22 37712394720000
23 430747632000
24 14454741869568
25 319672175961600
26 4080179409546240
27 14011605115200000
28 1653814216454400000

[1,1,1,2,3,6,5,360,420,56,756,75600,415800,
 2494800,8424,1223040,504504000,9081072000,
 5145940800,111152321280,754247894400,
 37712394720000,430747632000,14454741869568,
 319672175961600,4080179409546240,
 14011605115200000,1653814216454400000]

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 January 25 15:34 EST 2022. Contains 350572 sequences. (Running on oeis4.)