n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21147 |
10 | 115975 |
11 | 678570 |
12 | 4213597 |
13 | 27644436 |
14 | 190898290 |
15 | 1382887161 |
16 | 10477990158 |
17 | 82819430415 |
18 | 681282289857 |
19 | 5820296183791 |
20 | 51541816775857 |
21 | 472306124149579 |
22 | 4471549108520595 |
23 | 43676154621078016 |
24 | 439558508006341652 |
[1,1,2,5,15,52,203,877,4140,21147,115975,678570, 4213597,27644436,190898290,1382887161,10477990158, 82819430415,681282289857,5820296183791, 51541816775857,472306124149579,4471549108520595, 43676154621078016,439558508006341652] |