n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 48 |
4 | 408 |
5 | 5040 |
6 | 72000 |
7 | 1184400 |
8 | 22619520 |
9 | 482993280 |
10 | 11459750400 |
11 | 299495750400 |
12 | 8531976499200 |
13 | 263353163673600 |
14 | 8754879893760000 |
15 | 311808414677760000 |
16 | 11845876873678848000 |
17 | 478163414336864256000 |
18 | 20436460099541950464000 |
19 | 921972301728418676736000 |
[1,1,6,48,408,5040,72000,1184400,22619520, 482993280,11459750400,299495750400,8531976499200, 263353163673600,8754879893760000, 311808414677760000,11845876873678848000, 478163414336864256000,20436460099541950464000, 921972301728418676736000] |