n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 28 |
5 | 195 |
6 | 1866 |
7 | 22876 |
8 | 342392 |
9 | 6053445 |
10 | 123456790 |
11 | 2853116706 |
12 | 73686780564 |
13 | 2103299351335 |
14 | 65751519677858 |
15 | 2234152501943160 |
16 | 81985529216486896 |
17 | 3231407272993502985 |
18 | 136146740744970718254 |
19 | 6106233505124424657790 |
20 | 290464265927977839335180 |
[1,2,6,28,195,1866,22876,342392,6053445,123456790, 2853116706,73686780564,2103299351335, 65751519677858,2234152501943160,81985529216486896, 3231407272993502985,136146740744970718254, 6106233505124424657790,290464265927977839335180] |