n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 12 |
5 | 15 |
6 | 900 |
7 | 6615 |
8 | 90720 |
9 | 1995840 |
10 | 1360800 |
11 | 197920800 |
12 | 359251200 |
13 | 1297296000 |
14 | 7264857600 |
15 | 119870150400 |
16 | 2615348736000 |
17 | 29640619008000 |
18 | 533531142144000 |
19 | 101370917007360000 |
20 | 101370917007360000 |
21 | 425757851430912000 |
22 | 3325168819675422720000 |
[1,1,1,12,15,900,6615,90720,1995840,1360800, 197920800,359251200,1297296000,7264857600, 119870150400,2615348736000,29640619008000, 533531142144000,101370917007360000, 101370917007360000,425757851430912000, 3325168819675422720000] |