A119261 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

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 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A119261 as a simple table

n	a(n)
1	0
2	2
3	4
4	6
5	8
6	20
7	40
8	42
9	60
10	62
11	64
12	80
13	82
14	84
15	86
16	420
17	620
18	640
19	642
20	820
21	840
22	842
23	860
24	862
25	864
26	6420
27	8420
28	8620
29	8640
30	8642
31	86420

[0,2,4,6,8,20,40,42,60,62,64,80,82,84,86,420,620, 640,642,820,840,842,860,862,864,6420,8420,8620, 8640,8642,86420]