n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 20 |
5 | 210 |
6 | 3024 |
7 | 55440 |
8 | 1235520 |
9 | 32432400 |
10 | 980179200 |
11 | 33522128640 |
12 | 1279935820800 |
13 | 53970627110400 |
14 | 2490952020480000 |
15 | 124903451312640000 |
16 | 6761440164390912000 |
17 | 393008709555221760000 |
18 | 24412776311194951680000 |
19 | 1613955767240110694400000 |
[1,1,3,20,210,3024,55440,1235520,32432400, 980179200,33522128640,1279935820800, 53970627110400,2490952020480000, 124903451312640000,6761440164390912000, 393008709555221760000,24412776311194951680000, 1613955767240110694400000] |