n | a(n) |
---|---|
4 | 1 |
5 | 15 |
6 | 153 |
7 | 1330 |
8 | 10626 |
9 | 80730 |
10 | 593775 |
11 | 4272048 |
12 | 30260340 |
13 | 211915132 |
14 | 1471442973 |
15 | 10150595910 |
16 | 69668534468 |
17 | 476260169700 |
18 | 3245372870670 |
19 | 22057981462440 |
20 | 149608375854525 |
21 | 1012974972473835 |
22 | 6848956078664700 |
[1,15,153,1330,10626,80730,593775,4272048, 30260340,211915132,1471442973,10150595910, 69668534468,476260169700,3245372870670, 22057981462440,149608375854525,1012974972473835, 6848956078664700] |