n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 86 |
7 | 662 |
8 | 8120 |
9 | 171526 |
10 | 5909259 |
11 | 348089533 |
12 | 33883250874 |
13 | 5476590066777 |
14 | 1490141905609371 |
15 | 666003784522738152 |
16 | 509204473666338077658 |
17 | 636051958071749028811326 |
18 | 1375164117171886868027357906 |
19 | 4844133410739656724629165903483 |
20 | 29777568550007746192195431057341474 |
[1,1,2,6,20,86,662,8120,171526,5909259,348089533, 33883250874,5476590066777,1490141905609371, 666003784522738152,509204473666338077658, 636051958071749028811326, 1375164117171886868027357906, 4844133410739656724629165903483, 29777568550007746192195431057341474] |