n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 22 |
4 | 168 |
5 | 1720 |
6 | 22670 |
7 | 368784 |
8 | 7134148 |
9 | 159416704 |
10 | 4027395330 |
11 | 113235212800 |
12 | 3501763366904 |
13 | 118024658758656 |
14 | 4303855119215782 |
15 | 168777440194263040 |
16 | 7081468496171815500 |
17 | 316501174908316647424 |
18 | 15010862087643791689322 |
19 | 752916261526858377363456 |
[1,1,4,22,168,1720,22670,368784,7134148,159416704, 4027395330,113235212800,3501763366904, 118024658758656,4303855119215782, 168777440194263040,7081468496171815500, 316501174908316647424,15010862087643791689322, 752916261526858377363456] |