n | a(n) |
---|---|
4 | 1 |
5 | 10 |
6 | 70 |
7 | 424 |
8 | 2382 |
9 | 12804 |
10 | 66946 |
11 | 343772 |
12 | 1744314 |
13 | 8780912 |
14 | 43976688 |
15 | 219546976 |
16 | 1094132461 |
17 | 5448766458 |
18 | 27135655714 |
19 | 135218356264 |
20 | 674461583180 |
21 | 3368432133000 |
22 | 16847360404260 |
23 | 84396523333080 |
24 | 423485559461250 |
[1,10,70,424,2382,12804,66946,343772,1744314, 8780912,43976688,219546976,1094132461,5448766458, 27135655714,135218356264,674461583180, 3368432133000,16847360404260,84396523333080, 423485559461250] |