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!)

A138457 as a simple table

n a(n)
1 6
2 81
3 1875
4 14406
5 219615
6 599781
7 3006756
8 5864445
9 18469506
10 74264505
11 110822520
12 320481531
13 593409810
14 789743031
15 1346791956
16 2769558831
17 5271052035
18 6438316065
19 11304778881
20 16009359030
21 18913228506
22 30381063180

[6,81,1875,14406,219615,599781,3006756,5864445,
 18469506,74264505,110822520,320481531,593409810,
 789743031,1346791956,2769558831,5271052035,
 6438316065,11304778881,16009359030,18913228506,
 30381063180]

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 18:08 EST 2021. Contains 349526 sequences. (Running on oeis4.)