n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 3 |
5 | 10 |
6 | 20 |
7 | 98 |
8 | 307 |
9 | 2200 |
10 | 11253 |
11 | 122274 |
12 | 1039587 |
13 | 17865284 |
14 | 256702931 |
15 | 7235318376 |
16 | 178530216764 |
17 | 8498781072612 |
18 | 365328452613008 |
19 | 30052220838642600 |
[1,2,3,10,20,98,307,2200,11253,122274,1039587, 17865284,256702931,7235318376,178530216764, 8498781072612,365328452613008,30052220838642600] |