n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 21 |
5 | 150 |
6 | 962 |
7 | 8640 |
8 | 80220 |
9 | 884520 |
10 | 10709520 |
11 | 140873040 |
12 | 2098741680 |
13 | 32163828480 |
14 | 568234774800 |
15 | 9957054159360 |
16 | 203333391011520 |
17 | 4013297314266240 |
18 | 92967912795139200 |
19 | 2041979786688441600 |
20 | 52890421861957680000 |
21 | 1279950952105367942400 |
22 | 36648398470742114918400 |
[1,1,1,6,21,150,962,8640,80220,884520,10709520, 140873040,2098741680,32163828480,568234774800, 9957054159360,203333391011520,4013297314266240, 92967912795139200,2041979786688441600, 52890421861957680000,1279950952105367942400, 36648398470742114918400] |