n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 7 |
5 | 30 |
6 | 132 |
7 | 559 |
8 | 2416 |
9 | 10483 |
10 | 46072 |
11 | 204155 |
12 | 912779 |
13 | 4110644 |
14 | 18636572 |
15 | 84985825 |
16 | 389586145 |
17 | 1794268460 |
18 | 8298524480 |
19 | 38527095859 |
20 | 179487051589 |
21 | 838820171722 |
22 | 3931498431052 |
23 | 18475618863389 |
24 | 87036535974062 |
25 | 410947146076475 |
[0,0,1,7,30,132,559,2416,10483,46072,204155, 912779,4110644,18636572,84985825,389586145, 1794268460,8298524480,38527095859,179487051589, 838820171722,3931498431052,18475618863389, 87036535974062,410947146076475] |