n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 20 |
3 | 399 |
4 | 7960 |
5 | 158801 |
6 | 3168060 |
7 | 63202399 |
8 | 1260879920 |
9 | 25154396001 |
10 | 501827040100 |
11 | 10011386405999 |
12 | 199725901079880 |
13 | 3984506635191601 |
14 | 79490406802752140 |
15 | 1585823629419851199 |
16 | 31636982181594271840 |
[0,1,20,399,7960,158801,3168060,63202399, 1260879920,25154396001,501827040100, 10011386405999,199725901079880,3984506635191601, 79490406802752140,1585823629419851199, 31636982181594271840] |