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] |