n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 78 |
5 | 708 |
6 | 8256 |
7 | 117624 |
8 | 1980096 |
9 | 38456736 |
10 | 846413472 |
11 | 20819693568 |
12 | 565998548352 |
13 | 16852047061632 |
14 | 545372109629184 |
15 | 19061178127458816 |
16 | 715541912895773184 |
17 | 28713061759257037824 |
18 | 1226513716981332031488 |
[0,1,3,12,78,708,8256,117624,1980096,38456736, 846413472,20819693568,565998548352,16852047061632, 545372109629184,19061178127458816, 715541912895773184,28713061759257037824, 1226513716981332031488] |