n | a(n) |
---|---|
2 | 1 |
3 | 5 |
4 | 28 |
5 | 156 |
6 | 880 |
7 | 5005 |
8 | 28665 |
9 | 165104 |
10 | 955434 |
11 | 5550755 |
12 | 32355917 |
13 | 189147400 |
14 | 1108476720 |
15 | 6510243495 |
16 | 38308997100 |
17 | 225810489168 |
18 | 1333057076890 |
[1,5,28,156,880,5005,28665,165104,955434,5550755, 32355917,189147400,1108476720,6510243495, 38308997100,225810489168,1333057076890] |