n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 23 |
5 | 105 |
6 | 556 |
7 | 3409 |
8 | 24664 |
9 | 218686 |
10 | 2499812 |
11 | 38628853 |
12 | 829097387 |
13 | 24849303505 |
14 | 1035428836952 |
15 | 59712082983706 |
16 | 4754866838971645 |
17 | 522450200091413797 |
18 | 79208256385834752898 |
19 | 16575527137487435275695 |
[1,1,2,6,23,105,556,3409,24664,218686,2499812, 38628853,829097387,24849303505,1035428836952, 59712082983706,4754866838971645, 522450200091413797,79208256385834752898, 16575527137487435275695] |