n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 15 |
3 | 85 |
4 | 475 |
5 | 2501 |
6 | 13045 |
7 | 66965 |
8 | 341875 |
9 | 1736125 |
10 | 8789377 |
11 | 44389205 |
12 | 223796925 |
13 | 1126802885 |
14 | 5667555805 |
15 | 28483073133 |
16 | 143051171875 |
17 | 718060661765 |
18 | 3602769749125 |
19 | 18069618626645 |
20 | 90599060546905 |
21 | 454130626863845 |
22 | 2275813711825285 |
23 | 11402627696161685 |
24 | 57121117919938125 |
[1,5,15,85,475,2501,13045,66965,341875,1736125, 8789377,44389205,223796925,1126802885,5667555805, 28483073133,143051171875,718060661765, 3602769749125,18069618626645,90599060546905, 454130626863845,2275813711825285, 11402627696161685,57121117919938125] |