n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 55 |
3 | 1540 |
4 | 73815 |
5 | 5461512 |
6 | 581106988 |
7 | 84431259000 |
8 | 16104878212995 |
9 | 3910294246315600 |
10 | 1178924607035010836 |
11 | 432472873725488656424 |
12 | 189789513537655207705620 |
13 | 98222259182333060014344720 |
[1,4,55,1540,73815,5461512,581106988,84431259000, 16104878212995,3910294246315600, 1178924607035010836,432472873725488656424, 189789513537655207705620, 98222259182333060014344720] |