n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 225 |
7 | 3015 |
8 | 22545 |
9 | 473625 |
10 | 4637025 |
11 | 191508075 |
12 | 2288273625 |
13 | 123786785925 |
14 | 1735168572225 |
15 | 276775700288175 |
16 | 4433024011291425 |
17 | 510439906229029425 |
18 | 9196849128341801025 |
19 | 3123191121957643317075 |
[1,1,1,3,9,45,225,3015,22545,473625,4637025, 191508075,2288273625,123786785925,1735168572225, 276775700288175,4433024011291425, 510439906229029425,9196849128341801025, 3123191121957643317075] |