n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 36 |
5 | 240 |
6 | 1800 |
7 | 16800 |
8 | 191520 |
9 | 2328480 |
10 | 30240000 |
11 | 479001600 |
12 | 8083152000 |
13 | 142702560000 |
14 | 2731586457600 |
15 | 59056027430400 |
16 | 1320663933388800 |
17 | 30575780537702400 |
18 | 783699448602470400 |
19 | 21234672840116736000 |
20 | 591499300737945600000 |
[1,1,2,6,36,240,1800,16800,191520,2328480, 30240000,479001600,8083152000,142702560000, 2731586457600,59056027430400,1320663933388800, 30575780537702400,783699448602470400, 21234672840116736000,591499300737945600000] |