n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 20 |
4 | 218 |
5 | 3514 |
6 | 77386 |
7 | 2220504 |
8 | 80085792 |
9 | 3533917704 |
10 | 186779329704 |
11 | 11623513158960 |
12 | 839754709300800 |
13 | 69603737430736560 |
14 | 6552428441847854640 |
15 | 694531396130434062720 |
16 | 82265733994694038784640 |
17 | 10816812417663289139328000 |
18 | 1569560370536552329095091200 |
[1,1,3,20,218,3514,77386,2220504,80085792, 3533917704,186779329704,11623513158960, 839754709300800,69603737430736560, 6552428441847854640,694531396130434062720, 82265733994694038784640, 10816812417663289139328000, 1569560370536552329095091200] |