n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 5 |
7 | 20 |
8 | 55 |
9 | 125 |
10 | 251 |
11 | 2300 |
12 | 15775 |
13 | 70500 |
14 | 249250 |
15 | 750751 |
16 | 10006375 |
17 | 97226875 |
18 | 601638125 |
19 | 2886735625 |
20 | 11593285251 |
21 | 202808749375 |
22 | 2550175096250 |
23 | 20163891580625 |
24 | 122209131374375 |
25 | 613498040952501 |
26 | 13287626090593750 |
27 | 205055676105734375 |
[1,1,1,1,1,1,5,20,55,125,251,2300,15775,70500, 249250,750751,10006375,97226875,601638125, 2886735625,11593285251,202808749375,2550175096250, 20163891580625,122209131374375,613498040952501, 13287626090593750,205055676105734375] |