n | a(n) |
---|---|
1 | 3 |
2 | 6 |
3 | 20 |
4 | 54 |
5 | 275 |
6 | 556 |
7 | 1965 |
8 | 3498 |
9 | 10206 |
10 | 43453 |
11 | 68135 |
12 | 242812 |
13 | 536104 |
14 | 785437 |
15 | 1644136 |
16 | 4712040 |
17 | 12760906 |
18 | 17591088 |
19 | 44736332 |
20 | 81493581 |
21 | 109311863 |
22 | 257863391 |
23 | 448980978 |
24 | 1007135164 |
25 | 2840344772 |
26 | 4695605081 |
27 | 6015397025 |
28 | 9803584533 |
29 | 12473509636 |
30 | 20063812526 |
[3,6,20,54,275,556,1965,3498,10206,43453,68135, 242812,536104,785437,1644136,4712040,12760906, 17591088,44736332,81493581,109311863,257863391, 448980978,1007135164,2840344772,4695605081, 6015397025,9803584533,12473509636,20063812526] |