n | a(n) |
---|---|
1 | 2 |
2 | 10 |
3 | 60 |
4 | 420 |
5 | 4290 |
6 | 53130 |
7 | 903210 |
8 | 17687670 |
9 | 406816410 |
10 | 11125544430 |
11 | 338431883790 |
12 | 11833068917670 |
13 | 457077357006270 |
14 | 20384767656323070 |
15 | 955041577211912190 |
16 | 49230430891074322890 |
17 | 2740956243836856315270 |
18 | 168909608387276001835590 |
19 | 11054926927790884163355330 |
[2,10,60,420,4290,53130,903210,17687670,406816410, 11125544430,338431883790,11833068917670, 457077357006270,20384767656323070, 955041577211912190,49230430891074322890, 2740956243836856315270,168909608387276001835590, 11054926927790884163355330] |