n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 65 |
6 | 216 |
7 | 728 |
8 | 2472 |
9 | 8451 |
10 | 29050 |
11 | 100298 |
12 | 347568 |
13 | 1208220 |
14 | 4211312 |
15 | 14712960 |
16 | 51507280 |
17 | 180642391 |
18 | 634551606 |
19 | 2232223626 |
20 | 7862669700 |
21 | 27727507521 |
22 | 97884558992 |
23 | 345891702456 |
24 | 1223358393120 |
25 | 4330360551700 |
[1,2,6,20,65,216,728,2472,8451,29050,100298, 347568,1208220,4211312,14712960,51507280, 180642391,634551606,2232223626,7862669700, 27727507521,97884558992,345891702456, 1223358393120,4330360551700] |