n | a(n) |
---|---|
5 | 1 |
6 | 30 |
7 | 595 |
8 | 9880 |
9 | 148995 |
10 | 2118760 |
11 | 28989675 |
12 | 386206920 |
13 | 5047381560 |
14 | 65033528560 |
15 | 828931106355 |
16 | 10477677064400 |
17 | 131567066917650 |
18 | 1643385429346680 |
19 | 20439879147794485 |
20 | 253338471349988640 |
[1,30,595,9880,148995,2118760,28989675,386206920, 5047381560,65033528560,828931106355, 10477677064400,131567066917650,1643385429346680, 20439879147794485,253338471349988640] |