n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 31 |
5 | 355 |
6 | 3150 |
7 | 67172 |
8 | 904085 |
9 | 22998481 |
10 | 427799450 |
11 | 14914341926 |
12 | 287337926355 |
13 | 13421957361111 |
14 | 339940911160914 |
15 | 15434209582905140 |
16 | 493467700905592777 |
17 | 28101527071305611529 |
18 | 836396358233559195382 |
[1,2,6,31,355,3150,67172,904085,22998481, 427799450,14914341926,287337926355,13421957361111, 339940911160914,15434209582905140, 493467700905592777,28101527071305611529, 836396358233559195382] |