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!)

A215288 as a simple table

n a(n)
1 1
2 6
3 30
4 280
5 2100
6 23100
7 210210
8 2522520
9 25729704
10 325909584
11 3585005424
12 47117214144
13 546896235600
14 7383099180600
15 89212448432250
16 1229149289511000
17 15323394475903800
18 214527522662653200
19 2742051789669912720

[1,6,30,280,2100,23100,210210,2522520,25729704,
 325909584,3585005424,47117214144,546896235600,
 7383099180600,89212448432250,1229149289511000,
 15323394475903800,214527522662653200,
 2742051789669912720]

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 3 20:35 EST 2021. Contains 349468 sequences. (Running on oeis4.)