login
The OEIS is supported by the many generous donors to the OEIS 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 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)

A057405 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 9
5 0
6 24
7 36
8 90
9 228
10 468
11 1296
12 2946
13 7272
14 20808
15 48612
16 143028
17 362700
18 977562
19 2702592
20 7084962
21 20179368
22 54981234
23 154896552
24 438387402
25 1224515736
26 3507218586
27 9902866092
28 28373581638
29 81503463852

[1,0,0,0,9,0,24,36,90,228,468,1296,2946,7272,
 20808,48612,143028,362700,977562,2702592,7084962,
 20179368,54981234,154896552,438387402,1224515736,
 3507218586,9902866092,28373581638,81503463852]

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 December 2 11:02 EST 2022. Contains 358493 sequences. (Running on oeis4.)