n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 24 |
4 | 120 |
5 | 696 |
6 | 4536 |
7 | 32568 |
8 | 254136 |
9 | 2133816 |
10 | 19130040 |
11 | 182000952 |
12 | 1828296888 |
13 | 19311334200 |
14 | 213709376184 |
15 | 2470302259512 |
16 | 29746381049016 |
17 | 372270346391352 |
18 | 4831940144914104 |
19 | 64925998174811448 |
20 | 901626111996723384 |
21 | 12920858504042924856 |
[1,2,6,24,120,696,4536,32568,254136,2133816, 19130040,182000952,1828296888,19311334200, 213709376184,2470302259512,29746381049016, 372270346391352,4831940144914104, 64925998174811448,901626111996723384, 12920858504042924856] |