n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 18 |
4 | 180 |
5 | 2100 |
6 | 28800 |
7 | 458640 |
8 | 8361360 |
9 | 172141200 |
10 | 3954484800 |
11 | 100330876800 |
12 | 2786980996800 |
13 | 84133667217600 |
14 | 2742770705875200 |
15 | 96032990237184000 |
16 | 3594185336405664000 |
17 | 143193231131382432000 |
18 | 6050494745192177280000 |
19 | 270263142944131873536000 |
[0,2,18,180,2100,28800,458640,8361360,172141200, 3954484800,100330876800,2786980996800, 84133667217600,2742770705875200,96032990237184000, 3594185336405664000,143193231131382432000, 6050494745192177280000,270263142944131873536000] |