n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 18 |
4 | 69 |
5 | 306 |
6 | 1497 |
7 | 7890 |
8 | 45033 |
9 | 273474 |
10 | 1760301 |
11 | 11961522 |
12 | 85265325 |
13 | 636026418 |
14 | 4947725889 |
15 | 40019230386 |
16 | 335868650577 |
17 | 2918173355010 |
18 | 26199114476373 |
19 | 242657102748114 |
20 | 2314964975130261 |
21 | 22717352863875762 |
22 | 229029972003647145 |
23 | 2369438933865972498 |
[1,2,5,18,69,306,1497,7890,45033,273474,1760301, 11961522,85265325,636026418,4947725889, 40019230386,335868650577,2918173355010, 26199114476373,242657102748114,2314964975130261, 22717352863875762,229029972003647145, 2369438933865972498] |