n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 135 |
4 | 567 |
5 | 2268 |
6 | 8748 |
7 | 32805 |
8 | 120285 |
9 | 433026 |
10 | 1535274 |
11 | 5373459 |
12 | 18600435 |
13 | 63772920 |
14 | 216827928 |
15 | 731794257 |
16 | 2453663097 |
17 | 8178876990 |
18 | 27119434230 |
19 | 89494132959 |
20 | 294052151151 |
21 | 962352494676 |
22 | 3138105960900 |
23 | 10198844372925 |
[1,6,30,135,567,2268,8748,32805,120285,433026, 1535274,5373459,18600435,63772920,216827928, 731794257,2453663097,8178876990,27119434230, 89494132959,294052151151,962352494676, 3138105960900,10198844372925] |