n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 68 |
5 | 232 |
6 | 792 |
7 | 2704 |
8 | 9232 |
9 | 31520 |
10 | 107616 |
11 | 367424 |
12 | 1254464 |
13 | 4283008 |
14 | 14623104 |
15 | 49926400 |
16 | 170459392 |
17 | 581984768 |
18 | 1987020288 |
19 | 6784111616 |
20 | 23162405888 |
21 | 79081400320 |
22 | 270000789504 |
23 | 921840357376 |
24 | 3147359850496 |
[1,2,6,20,68,232,792,2704,9232,31520,107616, 367424,1254464,4283008,14623104,49926400, 170459392,581984768,1987020288,6784111616, 23162405888,79081400320,270000789504,921840357376, 3147359850496] |