n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 19 |
4 | 220 |
5 | 4196 |
6 | 120876 |
7 | 4915212 |
8 | 268194816 |
9 | 18903020544 |
10 | 1671209210880 |
11 | 181064295924480 |
12 | 23589442167333120 |
13 | 3638090042721918720 |
14 | 655483159341216541440 |
15 | 136420837710333144595200 |
16 | 32478481518550347674419200 |
17 | 8770206330674425311097651200 |
18 | 2666047809138871800854163456000 |
19 | 906320525390421790143785781657600 |
20 | 342508343836409428996994343026688000 |
[1,1,3,19,220,4196,120876,4915212,268194816, 18903020544,1671209210880,181064295924480, 23589442167333120,3638090042721918720, 655483159341216541440,136420837710333144595200, 32478481518550347674419200, 8770206330674425311097651200, 2666047809138871800854163456000, 906320525390421790143785781657600, 342508343836409428996994343026688000] |