n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 54 |
6 | 486 |
7 | 9720 |
8 | 204120 |
9 | 6531840 |
10 | 241678080 |
11 | 13050616320 |
12 | 652530816000 |
13 | 50244872832000 |
14 | 4069834699392000 |
15 | 390704131141632000 |
16 | 41023933769871360000 |
17 | 5538231058932633600000 |
18 | 731046499779107635200000 |
19 | 124277904962448297984000000 |
[1,1,2,6,54,486,9720,204120,6531840,241678080, 13050616320,652530816000,50244872832000, 4069834699392000,390704131141632000, 41023933769871360000,5538231058932633600000, 731046499779107635200000, 124277904962448297984000000] |