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A170739 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 2329805177964380
13 44266298381323220
14 841059669245141180
15 15980133715657682420
16 303622540597495965980
17 5768828271352423353620
18 109607737155696043718780

[1,20,380,7220,137180,2606420,49521980,940917620,
 17877434780,339671260820,6453753955580,
 122621325156020,2329805177964380,
 44266298381323220,841059669245141180,
 15980133715657682420,303622540597495965980,
 5768828271352423353620,109607737155696043718780]

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Last modified October 20 16:08 EDT 2019. Contains 328268 sequences. (Running on oeis4.)