n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 30 |
5 | 174 |
6 | 1284 |
7 | 11148 |
8 | 110604 |
9 | 1215180 |
10 | 15066936 |
11 | 205333416 |
12 | 3031876872 |
13 | 48536481096 |
14 | 834192650160 |
15 | 15357616617744 |
16 | 301627633467024 |
17 | 6274718094035088 |
18 | 137885714638938144 |
19 | 3199063553591292000 |
20 | 77943291010448903136 |
21 | 1991687512094232297696 |
[1,1,2,6,30,174,1284,11148,110604,1215180, 15066936,205333416,3031876872,48536481096, 834192650160,15357616617744,301627633467024, 6274718094035088,137885714638938144, 3199063553591292000,77943291010448903136, 1991687512094232297696] |