n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 65 |
6 | 226 |
7 | 838 |
8 | 3201 |
9 | 12386 |
10 | 48948 |
11 | 197608 |
12 | 809096 |
13 | 3345155 |
14 | 13980334 |
15 | 59041103 |
16 | 251334992 |
17 | 1076995274 |
18 | 4645807488 |
19 | 20164588874 |
20 | 87973297367 |
21 | 385580488738 |
22 | 1697545399851 |
23 | 7504250584691 |
24 | 33293669209338 |
25 | 148208341418642 |
26 | 661867001127396 |
27 | 2964446051683526 |
28 | 13313133410772356 |
[1,1,2,6,20,65,226,838,3201,12386,48948,197608, 809096,3345155,13980334,59041103,251334992, 1076995274,4645807488,20164588874,87973297367, 385580488738,1697545399851,7504250584691, 33293669209338,148208341418642,661867001127396, 2964446051683526,13313133410772356] |