n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 120 |
6 | 600 |
7 | 4200 |
8 | 33600 |
9 | 302400 |
10 | 3024000 |
11 | 33264000 |
12 | 405820800 |
13 | 5275670400 |
14 | 73859385600 |
15 | 1107890784000 |
16 | 17726252544000 |
17 | 301346293248000 |
18 | 5419293175296000 |
19 | 102966570330624000 |
20 | 2059331406612480000 |
[1,1,2,6,24,120,600,4200,33600,302400,3024000, 33264000,405820800,5275670400,73859385600, 1107890784000,17726252544000,301346293248000, 5419293175296000,102966570330624000, 2059331406612480000] |