n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 12 |
4 | 126 |
5 | 1800 |
6 | 33540 |
7 | 757680 |
8 | 20149290 |
9 | 616940520 |
10 | 21378058800 |
11 | 827126546400 |
12 | 35346832387020 |
13 | 1653593623521840 |
14 | 84055016334088800 |
15 | 4613207941230688800 |
16 | 271883701342581277950 |
17 | 17125855412989960236600 |
18 | 1148187688612239672677280 |
19 | 81635218693106948988998880 |
[2,2,12,126,1800,33540,757680,20149290,616940520, 21378058800,827126546400,35346832387020, 1653593623521840,84055016334088800, 4613207941230688800,271883701342581277950, 17125855412989960236600,1148187688612239672677280, 81635218693106948988998880] |