n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 105 |
4 | 550 |
5 | 5105 |
6 | 30918 |
7 | 265920 |
8 | 1773432 |
9 | 14632372 |
10 | 103605826 |
11 | 834224969 |
12 | 6128787272 |
13 | 48666035225 |
14 | 365893476096 |
15 | 2883831290602 |
16 | 22005412864334 |
17 | 172812531531152 |
18 | 1331535174196624 |
19 | 10442072847350585 |
20 | 80985489140322402 |
[1,8,105,550,5105,30918,265920,1773432,14632372, 103605826,834224969,6128787272,48666035225, 365893476096,2883831290602,22005412864334, 172812531531152,1331535174196624, 10442072847350585,80985489140322402] |