n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 15 |
4 | 55 |
5 | 200 |
6 | 725 |
7 | 2625 |
8 | 9500 |
9 | 34375 |
10 | 124375 |
11 | 450000 |
12 | 1628125 |
13 | 5890625 |
14 | 21312500 |
15 | 77109375 |
16 | 278984375 |
17 | 1009375000 |
18 | 3651953125 |
19 | 13212890625 |
20 | 47804687500 |
21 | 172958984375 |
22 | 625771484375 |
23 | 2264062500000 |
24 | 8191455078125 |
[1,4,15,55,200,725,2625,9500,34375,124375,450000, 1628125,5890625,21312500,77109375,278984375, 1009375000,3651953125,13212890625,47804687500, 172958984375,625771484375,2264062500000, 8191455078125] |