n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 11 |
6 | 31 |
7 | 106 |
8 | 337 |
9 | 1206 |
10 | 5031 |
11 | 20241 |
12 | 86901 |
13 | 421422 |
14 | 2014377 |
15 | 10015461 |
16 | 54946881 |
17 | 301009311 |
18 | 1692429867 |
19 | 10319449158 |
20 | 63321896601 |
21 | 395830490301 |
22 | 2648669976261 |
23 | 17920165424382 |
24 | 122976000215289 |
25 | 894420751179276 |
26 | 6596034524038701 |
27 | 49207275464475051 |
[1,1,1,2,5,11,31,106,337,1206,5031,20241,86901, 421422,2014377,10015461,54946881,301009311, 1692429867,10319449158,63321896601,395830490301, 2648669976261,17920165424382,122976000215289, 894420751179276,6596034524038701, 49207275464475051] |