n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 75 |
4 | 56 |
5 | 6930 |
6 | 28512 |
7 | 2849847 |
8 | 972400 |
9 | 693870606 |
10 | 99936200 |
11 | 63488350926 |
12 | 475814969280 |
13 | 166184959669300 |
14 | 497980728000 |
15 | 78877488833249175 |
16 | 1489333512849120 |
17 | 1116126129558913110 |
18 | 1597083864660900000 |
19 | 4467282986266589095530 |
20 | 107279471180408841600 |
[1,1,4,75,56,6930,28512,2849847,972400,693870606, 99936200,63488350926,475814969280,166184959669300, 497980728000,78877488833249175,1489333512849120, 1116126129558913110,1597083864660900000, 4467282986266589095530,107279471180408841600] |