n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 25 |
7 | 75 |
8 | 225 |
9 | 780 |
10 | 2704 |
11 | 10556 |
12 | 41209 |
13 | 178031 |
14 | 769129 |
15 | 3630780 |
16 | 17139600 |
17 | 87548580 |
18 | 447195609 |
19 | 2452523325 |
20 | 13450200625 |
21 | 78697155750 |
22 | 460457244900 |
23 | 2859220516290 |
24 | 17754399678409 |
25 | 116482516809889 |
26 | 764214897046969 |
27 | 5277304280371714 |
[1,1,1,2,4,10,25,75,225,780,2704,10556,41209, 178031,769129,3630780,17139600,87548580,447195609, 2452523325,13450200625,78697155750,460457244900, 2859220516290,17754399678409,116482516809889, 764214897046969,5277304280371714] |