n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 6 |
5 | 15 |
6 | 120 |
7 | 933 |
8 | 13303 |
9 | 252207 |
10 | 6450828 |
11 | 205475039 |
12 | 7936493756 |
13 | 363639228194 |
14 | 19476976825809 |
15 | 1205115679461426 |
16 | 85288127619421544 |
17 | 6845235025444882069 |
18 | 618411485467843477405 |
19 | 62471139399366989007575 |
20 | 7014991719815977343879171 |
[0,1,1,6,15,120,933,13303,252207,6450828, 205475039,7936493756,363639228194,19476976825809, 1205115679461426,85288127619421544, 6845235025444882069,618411485467843477405, 62471139399366989007575,7014991719815977343879171] |