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!)

A091983 as a simple table

n a(n)
0 1
1 20
2 180
3 560
4 1460
5 2520
6 5040
7 6880
8 11700
9 15140
10 22680
11 26640
12 40880
13 43960
14 61920
15 70560
16 93620
17 98280
18 136260
19 137200
20 183960
21 192640
22 239760
23 243360
24 327600
25 315020
26 395640
27 408800
28 502240
29 487800
30 635040
31 595840
32 748980
33 745920

[1,20,180,560,1460,2520,5040,6880,11700,15140,
 22680,26640,40880,43960,61920,70560,93620,98280,
 136260,137200,183960,192640,239760,243360,327600,
 315020,395640,408800,502240,487800,635040,595840,
 748980,745920]

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 November 30 05:12 EST 2021. Contains 349419 sequences. (Running on oeis4.)