n | a(n) |
---|---|
2 | 3 |
3 | 6 |
4 | 20 |
5 | 135 |
6 | 938 |
7 | 5726 |
8 | 33918 |
9 | 214711 |
10 | 1405611 |
11 | 9256932 |
12 | 61646145 |
13 | 416449189 |
14 | 2845389014 |
15 | 19604945890 |
16 | 136038928299 |
[3,6,20,135,938,5726,33918,214711,1405611,9256932, 61646145,416449189,2845389014,19604945890, 136038928299] |