n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 51 |
6 | 189 |
7 | 746 |
8 | 3091 |
9 | 13311 |
10 | 59146 |
11 | 269701 |
12 | 1256820 |
13 | 5966001 |
14 | 28773252 |
15 | 140695923 |
16 | 696332678 |
17 | 3483193924 |
18 | 17589239130 |
19 | 89575160517 |
20 | 459648885327 |
21 | 2374883298183 |
22 | 12346911196912 |
23 | 64555427595970 |
24 | 339276669116222 |
25 | 1791578092326881 |
26 | 9501960180835998 |
[1,1,2,5,15,51,189,746,3091,13311,59146,269701, 1256820,5966001,28773252,140695923,696332678, 3483193924,17589239130,89575160517,459648885327, 2374883298183,12346911196912,64555427595970, 339276669116222,1791578092326881,9501960180835998] |