n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 42 |
4 | 408 |
5 | 5328 |
6 | 84960 |
7 | 1600128 |
8 | 34957440 |
9 | 868247424 |
10 | 24152048640 |
11 | 744116855040 |
12 | 25155056424960 |
13 | 925729237969920 |
14 | 36842642690181120 |
15 | 1576774342552872960 |
16 | 72212210263605657600 |
17 | 3523820406525504552960 |
18 | 182532196288859620147200 |
19 | 10003033225361632653803520 |
[1,1,6,42,408,5328,84960,1600128,34957440, 868247424,24152048640,744116855040,25155056424960, 925729237969920,36842642690181120, 1576774342552872960,72212210263605657600, 3523820406525504552960,182532196288859620147200, 10003033225361632653803520] |