n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 21 |
4 | 84 |
5 | 425 |
6 | 2586 |
7 | 18137 |
8 | 145096 |
9 | 1305873 |
10 | 13058830 |
11 | 143647141 |
12 | 1723765788 |
13 | 22408955257 |
14 | 313725373682 |
15 | 4705880605425 |
16 | 75294089686800 |
17 | 1279999524675617 |
18 | 23039991444161430 |
19 | 437759837439067189 |
20 | 8755196748781343780 |
21 | 183859131724408219737 |
22 | 4044900897936980834346 |
[0,1,6,21,84,425,2586,18137,145096,1305873, 13058830,143647141,1723765788,22408955257, 313725373682,4705880605425,75294089686800, 1279999524675617,23039991444161430, 437759837439067189,8755196748781343780, 183859131724408219737,4044900897936980834346] |