A166601 - 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

A166601 as a simple table

n	a(n)
0	1
1	20
2	380
3	7220
4	137180
5	2606420
6	49521980
7	940917620
8	17877434780
9	339671260820
10	6453753955580
11	122621325156020
12	2329805177964190
13	44266298381316000
14	841059669244935600
15	15980133715652476800

[1,20,380,7220,137180,2606420,49521980,940917620, 17877434780,339671260820,6453753955580, 122621325156020,2329805177964190, 44266298381316000,841059669244935600, 15980133715652476800]