n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 10 |
6 | 45 |
7 | 253 |
8 | 1770 |
9 | 14028 |
10 | 125751 |
11 | 1256905 |
12 | 13825911 |
13 | 165902220 |
14 | 2156701326 |
15 | 30193705191 |
16 | 452904989670 |
17 | 7246477931241 |
18 | 123190111062756 |
19 | 2217421939553376 |
20 | 42131016700673761 |
21 | 842620333202031306 |
[1,1,1,3,10,45,253,1770,14028,125751,1256905, 13825911,165902220,2156701326,30193705191, 452904989670,7246477931241,123190111062756, 2217421939553376,42131016700673761, 842620333202031306] |