n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 15 |
4 | 73 |
5 | 391 |
6 | 2180 |
7 | 12620 |
8 | 75056 |
9 | 456004 |
10 | 2817879 |
11 | 17656517 |
12 | 111919061 |
13 | 716379379 |
14 | 4623944175 |
15 | 30062540989 |
16 | 196692237527 |
17 | 1294112710358 |
18 | 8556766562091 |
19 | 56829292404053 |
20 | 378936456243142 |
21 | 2535866861527016 |
22 | 17025875430611442 |
23 | 114654511539186113 |
[1,1,3,15,73,391,2180,12620,75056,456004,2817879, 17656517,111919061,716379379,4623944175, 30062540989,196692237527,1294112710358, 8556766562091,56829292404053,378936456243142, 2535866861527016,17025875430611442, 114654511539186113] |