n | a(n) |
---|---|
0 | 2 |
1 | 2 |
2 | 6 |
3 | 30 |
4 | 216 |
5 | 2040 |
6 | 23760 |
7 | 327600 |
8 | 5201280 |
9 | 93260160 |
10 | 1861574400 |
11 | 40914720000 |
12 | 981474278400 |
13 | 25512104217600 |
14 | 714251739801600 |
15 | 21426244519680000 |
16 | 685618901839872000 |
17 | 23310686975127552000 |
18 | 839178328730886144000 |
19 | 31888654846673264640000 |
20 | 1275543760964922408960000 |
[2,2,6,30,216,2040,23760,327600,5201280,93260160, 1861574400,40914720000,981474278400, 25512104217600,714251739801600,21426244519680000, 685618901839872000,23310686975127552000, 839178328730886144000,31888654846673264640000, 1275543760964922408960000] |