n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 20 |
6 | 85 |
7 | 520 |
8 | 3145 |
9 | 26000 |
10 | 204425 |
11 | 2132000 |
12 | 20646925 |
13 | 260104000 |
14 | 2993804125 |
15 | 44217680000 |
16 | 589779412625 |
17 | 9993195680000 |
18 | 151573309044625 |
19 | 2898026747200000 |
20 | 49261325439503125 |
21 | 1049085682486400000 |
22 | 19753791501240753125 |
23 | 463695871658988800000 |
[1,1,1,2,5,20,85,520,3145,26000,204425,2132000, 20646925,260104000,2993804125,44217680000, 589779412625,9993195680000,151573309044625, 2898026747200000,49261325439503125, 1049085682486400000,19753791501240753125, 463695871658988800000] |