n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 20 |
4 | 20 |
5 | 714 |
6 | 714 |
7 | 25550 |
8 | 90180 |
9 | 142803 |
10 | 809300 |
11 | 27195648 |
12 | 27195648 |
13 | 6973441007 |
14 | 37962822225 |
15 | 37962822225 |
16 | 114296059262 |
17 | 265228019405583 |
18 | 394047434860662 |
19 | 2493689139940250 |
[1,2,20,20,714,714,25550,90180,142803,809300, 27195648,27195648,6973441007,37962822225, 37962822225,114296059262,265228019405583, 394047434860662,2493689139940250] |