n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 15 |
4 | 45 |
5 | 231 |
6 | 861 |
7 | 3655 |
8 | 14365 |
9 | 58311 |
10 | 232221 |
11 | 932295 |
12 | 3725085 |
13 | 14913991 |
14 | 59639581 |
15 | 238612935 |
16 | 954386205 |
17 | 3817763271 |
18 | 15270790941 |
19 | 61084037575 |
20 | 244335101725 |
21 | 977343902151 |
22 | 3909371414301 |
23 | 15637499638215 |
24 | 62549981775645 |
[0,1,1,15,45,231,861,3655,14365,58311,232221, 932295,3725085,14913991,59639581,238612935, 954386205,3817763271,15270790941,61084037575, 244335101725,977343902151,3909371414301, 15637499638215,62549981775645] |